i cannot tell my sexuality?

[brandon]

i am a 14 year old male virgin and at the beginning of this year i started thinking that i was gay, not by any physical or emotional ways just that i seen a gay man on tv and i started to worry that i was gay, i have always been atracted to girls and have have a few girlfreinds, i have never been interested really in a man, but i think my mind is playing tricks on me, like i think of a freind (guy) and its like my mind automattically says GAY! but i dont think i am, i cant look at a girls ass on porn and get turned on, and a few months before i seen the man on tv i started watching porn every night and get an erection every night, the only weird thing is, im not super attracted to a girls vagina, mainly her ass, is this weird and do you think i am gay or straight? i really need help because i have been thinking about this since the begining of the year!