Butter (DD8) often draws attention to herself with her refusal to join. Last year, lunchtime would often find her hiding by the "book share" cart, instead of on the playground. Her teacher seemed bothered by this, but not me...in Girl Scouts, when we are doing crafts and the other girls have grouped themselves, she tends to pull off to the side or edge of the group...
Funnily enough, she is our top cookie seller, go figure...
I think it really bothers ADULTS that such a "bright girl" isn't more into socializing, but my DH is quite the same. He's super funny, really, but not into being in the spotlight...
I myself am also having problems working with a group of other adults...it takes too much time and overthinking to stroke their egos...