This kind of thing doesn't happen much anymore. It's funny, I actually felt like I moved past my social anxiety. Certain things can still trigger it. As for the "why"...let's see
Incongruence is definitely part of it. I usually shy away from the spotlight. I'm almost the opposite of an attention whore. At school there is no way for me to shy away. Everyone checks everyone else out. I'm comfortable knowing I don't need, or want to perform for anybody. However, when I notice girls are looking at me (when at school) I feel like I'm expected to do something. That's the incongruence. The feeling that I need to be someone other than myself. When that girl waved at me I stopped caring about everyone else and remembered that yours truly can reel one in from time-to-time. I remembered that I don't need to be "more" than me.
.
You are
allways in the spotligth if you are dealing with women.