I get like that when I go to one of my sisters parties. She's an artist so she's always having some kind of party. When I don't know anyone. It's really hard for me to interact.

I have a very similar problem. I hate when I have to do group work for school because I feel the pressure to have to talk to people but I am too afraid of sounding stupid, or being rejected type of thing. For instance, I have a theatre final coming up where I have to work with a partner and I'm dreading it so much and I want to avoid it and just stop going, but I know it will only make my social anxiety worse. I think I've learned over the past couple of years that avoiding social situations will just add to the social anxiety and if you do go to things, just be proud of yourself for being there. I've also learned that I overanalyze myself way too much and people don't normally do that to people, even if it may seem like people are looking at you weird or whatever, they're probably not in reality. You're not the only one though!