Hi CK23,
I'm fairly young like you, so I can definitely relate to the horrid experience of isolation in high school and middle school.
Social communication and friendship is such a delicate and intricate process, so many people who people such as us would deem "lucky" take their ingrown abilities to make friendships for granted.
I've noticed that making friends often has to do with how strong or weak your approach to them is. Most of time, like all other things, social approaches require a balanced medium casual friendliness.
You have to be careful to not go for the movie or lunch with an acquaintance that you may not know that well. Some people are fine with this, but many other might find this kind of activity something reserved for close friends only.
Like Rohag said, it's probably better to take your mind off trying to reach out and try to focus on some hobby or talent. Even if you're not really good at something, you'll still attract other people with similar interests that way if you're really into it.
I'll be around if you need a friend to talk to.
Best of luck in your struggles,
~Monsieur