Does anyone else not think that they're ugly?

In my opinion, I'm not ugly. Most days, I actually like how I look. However, the way I'm treated by others, especially the opposite sex, tells me that i'm ugly. Plus, I've never been in a relationship and no man has ever been interested in me. I've been made fun of for my appearance so many times. When I look in the mirror, I must be seeing something completely different than what everyone else sees. This makes it a lot more difficult for me to accept that I'm ugly. I try to tell myself it doesn't matter what anyone else thinks, but it's just hard when i'm treated like shit every day.