I'm really sorry to hear about this. But you know what? There HAS to be someone, at least one person, who cares so much for you. It could be your own parent(s) or someone you wouldn't necessarily even think of.
I think what you should do is try to think more positively. I get the feeling that you think that people are all out to judge you and that is not the case at all! They are busy with their own lives and probably don't even think twice about things you view negatively about yourself. If you're quiet, so what? I'm more on the quiet side, too. But you know what? I swear that some times, I get more respect for it because I don't try to be something I am
not and simply cannot be, and that is being really outgoing and talkative. I am what I am and I've learned to accept it. Well, in truth I am still learning to accept it. But I've gotten much better over the years.
Whenever you think, "Gosh, people just don't like me because I'm too quiet or not outgoing enough," you should follow up on that thought. Do all people respect and want to be like people who are really outgoing? Absolutely not! I know plenty of people (and outgoing people at that) who actually respect people who are more quiet. It takes all sorts!
You are being too hard on yourself. You seem to me as if you are getting yourself in these negative thought ruts and are sort of repeating them to the point where you think others are thinking the same things you think about yourself. You seem to be assuming that others are viewing you as you view yourself. This is simply not true and you must realize that!
I strongly suggest that you read a book called "Feeling Good - The New Mood Therapy" by David D. Burns. I have always heard that it helps people going through what you're going through tremendously. There are proven studies over it. Please consider. Look it up on Amazon or something and see all the positive ratings it got. I really think it could help you.
I really hope you get through this okay. I'm sure you're a great person. Everyone wants to be accepted and liked by others. It's all a matter of accepting yourself first, really. Good luck 
