How to deal with being an ugly girl?

I have no confidence in myself and want to hide away from the world because I am ugly. There is nothing special about the way I look. What looks the worst is my facial structure. It is angular, I have a double chin, and my eyes are shadowy and sunken in. I have permanent shadows under my eyes and lines, too, even though I'm only 16. I'm not fat or short, but I'm thin and boring. Guys don't find me attractive. I've only been asked out once, in 4th grade (which doesn't even count). How can I cope with this? Beauty means so much to me.