I feel you... I wrestled with a couple of things when I was in my 20's and early 30's; not just social anxiety as an issue, but also the more debilitating "avoidant" personality disorder which pretty much resulted in my becoming a self-loathing shut-in with a completely twisted sense of self.

Although I have had to present to groups and give workshops, I really can't stand doing it. I am evidently quite "good" at it, but I have never been comfortable with it.

As very much an introvert, I am quite comfortable with people in one-on-one settings-- that has rarely, if ever, been an issue. But the moment there are more people, I start feeling like I have to "split myself" order to keep up with what is going on, and after a while everything becomes "noise soup" and all I want to do is head for the nearest exit.

Needless to say, I was USELESS at the "club scene" when I was in college!