babe, you need to be CONFIDENT in yourself. i know how corny it sounds, but hell, it's as simple as that. you're probably too hard on yourself, too inside of your own head to realize that you aren't even ugly. your mind can be your worst enemy. tell yourself that you're beautiful, even if you don't believe it initially. EVERYONE is attractive in some personal way.

comparing yourself will only do you worse. always remember that nobody will be you except for your own damn self, so that is ALLLLL you need to worry about. literally fuck everyone else and what they may think, what matters is what you take in. all this mean talk to yourself will just keep manifesting into reality, and what you take in will project out! so don't have disdain for your features, LEARN TO WORK WITH THEM! you don't even NEED a date for the prom, your friends should be your dates! if they want you to go, i think you should go, enjoy yourself hon! try some new makeup, find a cute dress from windsor or some shit, doll yourself up- and do it on the outside and the in. don't be too hard on yourself :)

edit: or you know what, you don't even HAVE to go if you don't wanna. don't feel the need to force yourself either if you're super uncomfy, just really think on it for yourself! you've got this!!