Yes, I am an introvert.
No, I am not shy. 
No, I am not anti-social. 
I'm just listening.
I'm just observing. 
I can't stand small talk.
But I'll talk about life for hours.
I'd rather be home with a close friend or two rather than among a crowd of acquaintances.
Don't scold me in public. 
Respect that I'm reserved; and if I open myself up to you, know that it means you're very special to me.