Thanks to everyone for replying. I read about the "enneagram type four" personality and I identify a lot with it, although not completely.

Things I identify with:
-"Fours tend to escape reality into a world of idealized fantasy; this weakens their sense of feeling at home in reality. Their tendency to feel unappreciated can also increase this sense of alienation."
-"Fours are known for their tendency to hold onto sadness and melancholy; they frequently suffer from depressive episodes"
- "They have intense feelings of longing, nostalgia, and tragedy that leaves them discontented with their ordinary lives."
-"Fours look for a savior or ideal lover to rescue them from their vulnerable state."
-"Fours use their imagination and emotions to find their identities. They are very emotionally sensitive and have a deep need to connect emotionally to people and things."
- "They are seeking someone who can see them as they really are (this theme is present in many of their fantasies). "
- " Fours feel that Life has dealt them a bad hand and that Life owes them one."
-"They are often artists, or immersed in the artistic world where their visions can be freely expressed. " (I'm really bad at anything artistic but I try to improve and learn new ways form of art because I feel it's the only way I can express myself)
- "Even at their best, they are self-absorbed introverts. "

Things I don't identify with:
"Type Fours look to be different in their dress and their look is often highly mood dependent."
-"Type Fours often resort to changing their bodies with tattoos."
-"They judge themselves to be too ordinary and common."
-"It is not in their nature to fight life’s challenges. Instead, they will ponder on how they wish things were different, and wait for someone to save them from their own misery."

Well, I dress fairly normal and I'm not worried about how "original" my look is, nor do my looks depend on my mood. I look like any ordinary person and I'm ok with it. I also don't like tattoos or anything that modifies the body.
I think I do try to fight life's challenges. Even if I like to fantasy about finding someone, it's not like I don't do anything at all to change things and just wait for someone to change everything for me. The problem is, it's hard for me to change how I feel, even if I try.

It's not that I try to be different from everyone else, I just can't help feeling that way. Because of how I was raised, my life experiences, etc. I spent the last 8 years (late childhood and teenage years) alone in my room with the internet as my only company. Thanks to the internet, I was able to discover lots of things I otherwise wouldn't have had access to. It's also how I learned English. I'm from Argentina so my native language is Spanish, but since I was surrounded by a lot of English-language content on the internet, I learned how to speak it. I always visited websites in English. I sometimes feel that I'm part of the "internet world" more than the real world, if that makes sense. Sometimes I feel like a foreigner in my country.
I'm also a big daydreamer, it's something I do since I can remember.

I was alone all through primary school (age 6 to 12). When I was 6-7 I simply didn't have any friends at school, I have no idea why. In the recesses I liked to walk around the school alone, immersed in my thoughts. I didn't really want other children's company. But then at the end of my second primary school year (I was 7) some girls told me they wanted me to be their friend. I suddenly had friends and I was happy about it. As I said before, I didn't feel the need for friends but when I was presented with the opportunity to be friends with those girls, I was very happy about it. However, just when I had made my first friends, I was transferred to a new school. I continued in that school until my last primary school year, and could never make friends with anyone. At first I missed those friends I had made in the other school and regretted the change. But then I stopped caring. I daydreamed a lot and didn't think much about the real world.

Remember I have no siblings, so I spent a lot of time playing alone. At age 8 or 9 I started getting interested in being the "popular girl" at school. I think this was motivated by all the TV shows I watched at the time. I also started daydreaming about being a celebrity, again, motivated by the TV shows and teen magazines I had access to. At school, I was still alone, though. I didn't really feel the need for friends. I mean, I wanted to be popular and all that but I didn't care much for other kids. I got my first personal computer at the age of 9. At this age I was very interested in teen celebrities like Miley Cyrus or the Jonas Brothers, basically all I saw on Disney. So I used my computer to search for music or videos related to them, I spent a lot of time doing this. I even learned how to make my own videos. They were songs translated to Spanish, and I had my own Youtube channel. I used to hide all this stuff from my parents. It's too long to explain here, just know that I always hid things.

At age 10-11 I was alone all the time at school and sometimes made facial gestures corresponding to what I was daydreaming, and other children thought I was weird, that I was crazy or something. Some teachers told my mom I had some mental problem and that she should take me to a psychiatrist. One teacher told her "in the US children who are like that end up shooting schools" Probably the only reason they said that was because I was alone all the time and maybe they heard other children saying I "talked alone" Yeah, most people thought I was pretty weird at that time. It didn't affect me, though, because I was in my own world, lost in my thoughts and daydreams. The internet, with the access to all sort of movies, TV series, websites and lots of information, only incentivized my daydreaming even more. I liked to investigate about my favourite bands or singers.

Then in 2012 things changed. I met a guy and fell in love with him. Whoever, this guy was 16, so there was an age difference. I was quite mature for my age, both mentally and physically. People constantly told me I didn't look like I was 12, but more like 16 or 17. He was a friend of my (male) cousin. My cousin had a rock band and he constantly hang out with his group of friends. I wanted to belong that group, I wanted to date that guy and be friends with the rest, go to the concerts and hang out with them. But I never had the chance to. I only saw them once or twice a year. I stalked them on Facebook, and that's actually how I got to know more stuff about the guy I liked and how I fell in love with him (he posted a lot about his life and personality, so I sort of had an idea of what he was like) During 2012 and 2013 I spent most of my time daydreaming about being with that group of friends and dating that guy. I tried to find any chance to be with them, but it never happened. I used to cry when thinking how impossible it was for me to be with them. I understand they didn't want to hang with me, though, I was 12, and they were like 16-17. As you can see, at that time I still didn't feel completely different from everyone else and still felt like I had a chance to get a boyfriend or make friends. Eventually I just got tired and stopped caring about them. When I was 13 I entered secondary school. At first I didn't talk with anyone but then I started talking with a girl who became my friend. However, our friendship was never really "intimate", so to say. We only talked at school, and saw each other only at birthday parties or maybe we would go to each other's houses once in a year. On school holidays we didn't talk. So I was still alone most of the time. I spent all day in my room, always in the internet. I had new daydream themes now. And I also started getting interested in learning languages. There are more things I could say but it would be too long. I hope you get a general idea of how I am so you can understand better why I feel this way. It seems like other people and me are in completely different planets. It's hard for me to make friends and I never meet people with whom I can identify, someone that makes me want to get to know them more. I talked to my psychologist about the fact that I feel alone, and she's said I need to hang out more with people at my school and keep talking to them until we have a close relationship. But I've known these people for 5 years and it never evolved to a close friendship. I've gone to different parties, I've gone out with multiple times, I've gone to their houses (here I'm talking about 5 people who sit near me in class) and it never seems to work. When I'm with people I still feel lonely.

I just want someone that understands me, someone I can talk to openly about all my problems, the "weird" side of me (my daydreams, for example) without being judged, someone with who I can feel comfortable. Someone with who I can truly be myself. Preferably someone with a similar way of thinking, or with similar life experiences. I sometimes feel so excruciatingly lonely. It's hard for me to explain why I feel so different or "disconnected" from people.

If you know about astrology, I have a Moon in Leo in the 12th house. I don't actually believe in astrology but I identify with the interpretation of a lot of stuff I see in my astral chart. Basically the 12th house represents what's hidden, and Leo is the sign of self-expression. The moon represents emotions and also the mother or the family in general. You can google more about it. My point is, I always feel like there is a hidden part of myself, always a part of me that isn't really expressed.

I have mood swings. There are moments when I feel really bad. I have suicidal thoughts, I can't stand the feeling of alieness, I can't stand thinking about all the things I dislike about life, I feel like I have no future, no way out, like I can't adapt to normal life. But there are times where I feel ok for no reason. Right now, I'm feeling ok but hours ago I was in a terrible mood. I think my brain tries to compensate so many sadness and bad feelings with a feeling of calmness every now and then.

I'm glad I found out about the Enneagram personality type four. It's crazy how much I identify with it, even if not completely. It's good to know there are similar people out there.