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 always hate talking about my confidence problems as a young dude because I am afraid I will get read as an incel or something, which I definitely am not! I can't really find a way to help myself because of that reason so I just never tell anybody but that really makes it worse.