Or they are clearly drooling over you? Call you "hot", or "cute?"
Then the cute guys don't seem to notice you at all? You've been called pretty by numerous other people, but you are invisible to the cute guys?
I'm going to be honest, when I look in the mirror I'm surprised that cute guys don't approach me. I dress well, I'm friendly, funny, etc.
It doesn't matter how much confidence I have, how much fun I'm having, or how big of a smile I have on my face, cute guys don't seem interested.