It's 100% untrue. Men are beautiful. You are beautiful. Believe in yourself and remember that the most attractive thing in the world is a kind heart and that starts with being kind to yourself.
Don't let the world make you feel ugly, they're just trying to sell you shit.
I'm glad I had the bear subculture of the gay community. It taught me that all men are attracive not just jocks and twinks. It took me a few years but I grew to love my back hair and big belly.