lots of us have some degree of social anxiety. I played Bass for 6 years in a band. It was great. I didn't have to talk (couldn't talk and play at the same time anyway) and I could have fun and be with friendly people. Another benefit was i could be on stage and be behind everyone else, i never ever took "center stage" I liked that!
I noticed that a lot of my musician friends did better with the instruments than they did with conversation!