Poor Op... Sure hopes he be trollin', not cryin' fur realz... But, just in case he's in earnest. OP, don't worry about who you've had sex with! Enjoy what you do, avoid what you don't and be whatever you can be without forcing yourself. You're probably mostly straight, but if you were entirely straight, I doubt that you would ever have been interested. That said, sexual desire lies along many continuum other than hetero-homo. Perhaps the attraction was in the novelty, perhaps in the taboo, perhaps int he risk, perhaps in the clandestine nature, who knows. You wanted it, now you don't. Simple as that, and no more conclusions need be drawn!
Sexuality is not a choice. Nor is it one thing or the other. It's a balance of hormones & everyone is unique where they fall on the 'Bi' scale. Consider this, though, if you were blindfolded & were to be Masturbated or given Oral by someone, unknown to you, assuming the person doing it didn't say anything which might identify their gender, would there be any way of telling whether they were male or female? Of course not, but you would enjoy the physical stimulation equally nonetheless.