I find I am quiet or as I say "reserved", I can sit in a room and not get involved in the conversations around me if the chat doesn't fit the way I feel.
Loud people dominate conversations and people laugh as I daren't say anything otherwise fear getting the pee taken out of thm or singled out, so the person goes on and on (pretty boring!). I wouldn't mind but these are th people that enjoy talking about themselves but never ask you a question about what you've been doing or make any effort to involve you in the conversation, very annoying so I keep contact to a minimum with these type of people. I respect those that respect your opininon and listen, if people are quiet I don't worry too much, sometimes people like to think inwardly and keep their toughts to themselves, I respect that.
I know I've gon on a bit, be who you are and not what everyone wants you to be. Part of getting over or dealing with SA is self acceptance.
All the Best
LK