Hello .
I think that one fact to remember is that its not just you who's dealing with social anxiety. Sometimes, people get nervous when they think about how others are going to react to what you say and do, and its completely normal.But what you can do to lessen is is to learn to enjoy the situation, and act like how you want to act and put yourself in the mix and enjoy it the way you want. I find that when you're natural and genuinely immersed into what you're doing, your brain spends more time enjoying and taking in positive signals, rather than think about what could go wrong.
Besides that, if you make mistakes.. we all start somewhere. The most important note here is to give others a chance, and then to give yourself the chance to give others a chance. That will truly enable you to enjoy social situations more.
As always, if you need someone, I'll always be around. You can rant to me anytime!