I remember when people would always come up to me and say "smile," it used to bug the heck out of me. I have suffered so much with social anxiety, but right now I have managed to push past it to a great extent. Of course some days it depends on my mood, but my job involves working with the public. However, it is only on a one-to-one basis, which works better for me.
I hate crowds, parties, groups, etc.
Juls