FtM: Fell in love with my best friend but...(Please I need help)?

Honestly, I wouldn't blame it on your body. It's a convenient scape-goat, but the truth is, if a gay guy really liked you, he wouldn't care, or he would deal with it, if it was just your body. He doesn't like you like that for you (which isn't that much better, but at least it won't damage your body issues). And no, kissing him will not help. You have one-itis, as they say in the pick up artist community. One-i is an obsession with one person, it dates back to when we lived in tribes, and there were few people to choose from. But now we have billions. There will be more (tons more) cute gay guys, that you will have crushes on, that will be better than him. He's only special because he's the only one. In the PUA community, the regimen for getting over one-itis, is to sleep with 12 other people, and see how special your "one" still is now. I wouldn't suggest that for someone as young as you! But I would suggest you meet people, and make lots of new crushes.