I've recently been discovering some interesting things about my social personality.
When I am in a grocery store, or another large buy-your-stuff-cheap discount store, I hope that I don't see people that I know. Really, this only applies to people I know as acquaintances. I fear meeting old high school classmates when I grocery shop in my home town. I hope I don't run into people I know passingly through church. I find these situations very awkward. I'm not good at small talk, and I make the wrong facial expressions at inappropriate moments. Sometimes, if I see people I know, I will quickly turn to a different aisle, hoping that they won't have noticed me. I'd like to think that I can be anonymous when I shop, but sadly, no.
I don't have much of a problem talking with the strangers in the checkout line. It's not like I avoid all people. But, it's still weird.