Have you ever seen that movie that Dove made about women who came in and described themselves to an artist who drew them from their descriptions? Then they had another person come in (whom they had met and talked to previously) describe them and they compared the drawings. It's pretty amazing if you can find it on youtube.
We often think of ourselves as much uglier than we really are. We all have built-in "funhouse mirrors" in our eyes. When your boyfriend tells you you're beautiful, it's because you are!

Here's the link to the vid: