Well, i can kinda relate to you. Sometimes when i'm put into a
group of people, i'll tend to feel very sian and don't want to
talk. Most of the time while everyone is talking, my mind will be
drifting off to gf and other stuff. So usually, i am quiet and
reserved.
But i find it helps alot to pretend to be enthusiastic. Laugh alot.
And basically, act like you're having a good time. It's tiring, but
that's how the world is-Hypocritical.
But usually, i only pretend enthusiastic when i know i'm gonna be
stuck with this group of people for sometime, e.g. classmates.
Else, i'll just be myself and be uninterested.