Gay/Bi Guys : Is this weird or normal to you?

I'm a bi teen boy and every guy I find attractive I'll just stare at his and get turned on looking at it! Lol while IM looking I start to fantasize about how I'd be on his @$$ and rubbing up and down against his backside usually with the both of us wearing jeans or underwear. Idont wanna sound weird but why am I so into a guys but I always wanna grab a hot guy and him ually or do something else with him , wht u think?