If you do not value yourself, no one else will value you. Beauty is relative and everyone's dislikes things about themselves. I have rarely met an overly attractive man or woman who thought that they were, in fact, stunning.
Here is the scenario from the "Attractive" person's perspective:
You are at a bar or party and everyone thinks you are beautiful and so they are afraid to come speak as they fear you are stuck-up and will diss them. So, the only people that come to speak to you are drunk or stoned out of their minds. And you don't want to interact with drunken stoners, so you decline. Sadly, the people who are afraid assume that you are an asshole when, in fact, all you'd like is for a nice person to talk to you.
We all have insecurities. The challenge is to control your fears rather than allow your fears to control you.