I have no idea which i like?

the thing is im a 17 year old boy and im confused. big time confused. i look at naked women and i dont get turned on whereas when im with a girl i get turned on big time. when i look at pics of men i get turned on but i dont really like it ( no offence) i think im bi but i dont want to be i wanna be straight. is there anyway to be straight i never think of guys much only when i feel like it. i dont get turned on by guys and i dont feel the urge to fancy one either. it feels wrong to me. i wanna be myself but in all fairness i dont know who i am. am i bi or is this just a random teenage hormone thing? please help its very much appreicated! :)