Being myself.

Why is it that I become a different person when I am talking to an attractive person? It doesn't make much sense, I feel. Like there's some sort of intimidation that I can't overcome, so I feel like I have to put on a mask or something. I can't just "be myself" or "act normal". It bothers me. When I speak to an attractive guy, or even a girl for that matter, I censor myself, somewhat. But I let my guard down more when I'm interacting with a less attractive person. Why is that? What makes me feel more comfortable around homelier people than good-looking people? Is this just a phase? I hope so, because I don't like not being myself. I don't like feeling like I can't say or do what I want in front of someone. But maybe it's just the energy they give off that intimidates me. Maybe if I were blind I wouldn't have this problem. :-/