The centre of attention

I have come across a major flaw in this whole wedding malarkey.
I sincerely dislike being the centre of attention. I get very easily embarrassed by things and when that happens I can get a bit tongue-tied.
But why? What is it that I get embarrassed about?
It's probably something to do with the fact that I don't see why anyone would want to look at me. Unless I'm performing onstage/doing something worthy of attention then I'm like a duck in water.
It's probably some deep-seated inferiority complex - if only I knew a psychologist.....