Can't look at mirror too long, freaks me out

I used to (and still do to a certain extent) have a problem with looking at myself in the mirror for more than about 10-15 seconds. It triggers a stream of meta-cognition that causes me to have a sort of out-of-body feeling that really freaks me out, and the longer I stare, the worse the feeling gets, to the point where I have to shut my eyes and think as hard as I can about anything else for a while, and try to forget the whole experience.

In fact, I have a similar problem when I think about parts of my identity for too long (e.g. my name, my age, etc.) It's kind of like when you say a word so often it loses its meaning, though you still know what the meaning is; it's a question of stopping taking something for granted that is so obviously true, and questioning it. And when you question things that you take for granted for so long, especially if they're about yourself, that should freak anybody out.

Is It Normal?