Could this be HOCD???????

First off im 17, before a few months ago I was always phobic and used to make fun of gays (I know, I regret it, and its probabley karma, but im sorry :/ I now respect them) I have always been just a straight kid who loved girls and football and stuff. I had a few ual encounters with a girl when we were both 5,I just always knew I was into girls. When I started puberty I just couldnt get enough of girl and masturbating, A few months ago though I just stumbled across "what if im gay" and OBSESSED over this situation, I thought of boys before in that way but I was always sickened, For 3 months straight it has been on my mind everyday, gay thoughts and stuff, and now im deluded into thinking im gay, I look at all boys in a ual way and I hate it, Im afraid to go outside incase I act on my thoughts, and recently ive thought about it that much that my mind is telling me to get a boyfriend, even though im not gay, I have no control over my mind, I hate my life, I think im losing all my attraction for girls, but I still watch straight/ and fantasize about girls, I tried a few gay videos but it doesnt arouse me and make me erected. Im just so scared, Im convinced im gay and I have no control over my mind, Am I still heteroual and just obsessing and paranoid? Could I have turned gay? Is it a phase? Im almost ready to come out and tell everyone im gay, but theres one problem im not gay, im sick of checking gay repeatedly to see if i get an but i never do, I never have, Ive had girlfriends, I just want to go back to normal, this is on my mind 24/7, My mind is telling me im gay, but my is telling me im straight.