I'm sorry you feel that way being afraid and uncomfortable around people is one of the worst things for me too.

If it makes you feel better, pretty much all people are too focused on not making a fool out of themselves to dislike anything about you. I know personally when I'm meeting people I'm much more focused on my own actions than the other person.

But I really am sorry you don't feel like you fit in. A lot of the times I feel like that too. Mainly because I'm not smart enough to hang out with my smart friends. Or not artsy enough to hang out with my artist friends. Or not silly enough to hang out with my goofball friends. So I just bounce around a lot on the outer rings and I feel like I miss a lot on inside jokes and etc. But hey, you are most definitely not worthless