Well Joe is not a friend, that's the type of people that as you grow older and experienced you learn to spot from day one and delete them from you friend book.
As for being fat, well, it's not as if your were blind, it's not a fatality, you can, with will, change it, but don't change it so other would accept you, fuck others and what they think, change it because you want to, and if you are happy the way you are, then don't change it. People will always find something in you to point out, always, and no matter how hard you try.
I don't remember who said this but it goes like: I don't know the way to success, but I know the way to failure: try to please everyone.
Chill out friend, and always laugh it out, it's all a game