Hello, BlueMoonBlueEarth. Fellow Brony here. Sorry if I'm a little late to the party, but I stumbled upon your story and felt a great need to reply. I want to let you know that I am actually very familiar with your feelings. Like you, I am very much in love with Fluttershy; there are days when I wish she was real, especially whenever I'm feeling down in the dumps. And those feelings are completely okay, I think. I can tell that your love for her is not an un-healthy obsession; it appears to me like you want to show love and appreciation for the truly kind-hearted and compassionate people in the world.
I think since we are always surrounded by so much stress, anger and aggression in real life, a lot of us want to have a deeper connection with those who are gentler and can make our days feel much brighter. This is also one of the biggest reasons why I love Fluttershy—though timid and the very definition of a shrinking violet, she can make anyone feel loved and belonging. A strong part of me wishes there were more people like her in the world for this reason alone. It's nothing to be ashamed of, and maybe one day if you're lucky, you will find a wonderful significant other who is very much like Fluttershy.
Now, about that Gilda fan you had the unpleasant experience with. While I do want to convince myself that the Brony community is all about love and support for one another, there are many others who fill our space with rude and obnoxious mannerisms. The problem is, most interactions of the fandom take place on the internet, where you can pretty much say anything you want and get away with it. I, personally, have a major problem with the control of this content spreading, because people don't understand the types of effects their words have on others.
The key is to not take what they say about you as personal or too seriously. One person will never define who YOU are, or how the whole world sees you. Only you know what kind of person you are. If Fluttershy did exist, I think she would want you to keep doing what made you happy, knowing that there are tons of people behind your back. So whenever you feel down and out, or like you are alone and scared, just remember these three words: Fluttershy Loves You.
I do hope you start feeling better soon and that you will win this personal fight. But for now, simply Keep Calm and Flutter On, and if you ever decide to return to watching the show, we will be there, welcoming you with open arms. Because friendship is magic.