I just don't know what to do anymore?

You poor thing. Love sucks when you're young. Try not to get down though. It won't always be this crappy and intense. And other people are right: you should go to your homecoming with your friends and sack the idea of a guy off. It isn't even the end of the world if you don't go. In England we have Leavers' Balls (the equivalent of your "prom") and instead of going to mine, I went out with my 7 years senior boyfriend but his car broke down so I didn't even end up going out that night, plus 6 months later he finished with me in favour of a drug addict colleague who he'd been cheating on me with and who ended up stealing £5,000 from him. Hey ho. Anyway, I hate the way these proms put so much pressure on young people to have "a date". That's such a superficial value to instill in people. I'd have positively hated it.

And stop feeling so low on yourself. Remember, there's not a person in this world who doesn't have their issues and just because you're overweight doesn't mean you're ugly. You're still probably beautiful on the inside and out, and there's always going to be people that find you (not just you, anyone) attractive and others who don't. Besides, with hard work and commitment, you can lose weight if it makes you happy, and that would feel really good.

As for the dress, well, that's a sad story and that's a very typical way in which life slaps you around sometimes.

Cheer up, count your blessings: things could be so much worse and you're probably very lucky in many ways.

still go to homecoming! A lot of people go alone... tons of guys asked me but I told them all no, because I rather have fun with my friends, then have some awkward date type of thing. Prom is where you should be concerned when you don't have a date.

Well, don't call your self ugly because everybody looks good in someones eyes, and you don't have to have a date to go to homecoming, just go with some of your friends and just relax and you'll have a lot of fun.