Im 13 and i get s over men in jeans and belts but i look at a naked man and i dont feel anything?

Jeans' is very common (men & women, gay, straight whatever). They show off a guy's and junk, they feel good on you and have a "ruff & tuff" image. So....maybe you've got a thing for looking at a guys junk, maybe you're transferring how a hot dude looks in jeans to how you look or want to look, maybe you've got gay impulses you haven't identified yet, maybe not.........so what, doesn't matter. It's a harmless affectation......and it's too early to know what is gonna do it for you. Just be ready to accept your natural preferences and act on them.......anything and everything is OK as long as you don't intentionally hurt someone.