Unsure about sexuality need help.?

[M H]

Hey, im male 14 and really confused with my sexuality, first time i got paranoid about my sexuality was when i was 10 however i later ignored it, but about two years ago i got really scared about what sexuality i am, i recently concluded that i have hocd; unwanted thoughts of men, i have them during masturbation when what i really want is just to look at the girl this really scares and annoys me, i think of men when coming and i fear that i will become gay because of it, i have started puberty but i worry this hocd will affect my sexuality at this time of my life when i start to know who i am. I dont get erections over men when i think of them, when i think of penises i dont get an erection, when i think of having sex with women i get erections, theres this girl in my class in particular that catches my eye but i dont know whether i like her a lot because i have never fallen or had a another crush on a girl and this hocd, i've never kissed one for that matter. This hocd i have just really confuses me, and lately i have started to get minor erection over random guys in the street, i dont know if this is a bad coincidence of a random erection or if i'm attracted to men, i can tell if a guy is good looking but i dont want to have sex with another guy, i want to be straight could this be puberty? I know im not gay deep down because i still get erections over women but i fear hocd will change me. Please help. The stress is turning my hair grey and im bloody 14!!!!!! (also i have this excitement feeling when i think of women and men but more for women)