We call it socially selective

Dear future hubster,

I think I'm officially a closet introvert: I consider my weekend a major achievement not only because of having made it up and then down the mountain, but also, and almost more importantly, because I have spent it with a group of people I hadn't previously known, and was anxious about it only about half the time. I didn't even panic!

I think I kick ass. Or, more accurately, I would, if I could move any part of my body.