Rule #1: Realize that everyone has these feelings to some degree or another, especially in a place like this because DWRP is filled to the brim with insecure, anxious social rejects. They're as scared of you as you are of them.

And it's never going to go away completely for the same reason, but working around it is something you can practice and gain more confidence from. Encourage yourself to speak up, open up, and make friendly with people that you feel irrationally snubbed by, and over time it'll get easier.