Is it normal that i fantisize about boys?

I am 18 years old, and i fantisize about boys at college and people i work with. i used to get bullied a lot and still do, boys calling me gay and acting gay around me. however i only look at gay porn becuase i believe i am gay, because of how i have been treated. i have had many great and beautiful girlfriends, however is it normal to fancy/ fantisize about lads?