Am i biual?????? help?

im a guy and i always been attracted to girls and i to girls but today out no were im like let me think about a guy ad just to make sure i dont like it cause i have like ocd, and i got a but doing a guy is gross to me now but when i was laying down i just got one and when i get s it feels good and i think im bi! i dont wanta relationship with a guy i made sure i didnt like it and i went to gay and it was nasty im 15. is it just because i was like comfortable?