Alright my hopeful internet friends, i have an embarrasing problem and it is hurting me in ways I can not really describe. I was in a relationship of about 4 years, i am a 21 year old male. I have ADHD. The girl i was with was pretty and everything. It was bad. We broke up because she had sex with someone else, whcih affected me for awhile, but i guess im fine now. I hooked up with a girl a couple hours ago, and she was really pretty, very nice, had very large mammory glands which im not used to, and i like talking to her alot. Sounds perfect right? Here is the problem.....

lately i guess ive been questioning my sexual preference and such, today after i came home from her house, and when i was making out with her and stuff i was erect and stuff but it didnt totally feel right. Now ive had sex with only one person, and have done only things with other girls that I dont need to go into. Regardless, Im sort of having strange thoughts. I am having thoughts of guys sometimes when i watch porn, I can't tell whether I;'m atttracted to a penis and i only watch straight porn but when a guy performs oral sex on a girl ,this revolting thought of a guy having oral sex with me pops into my head, and ive had trouble in my head in the recent months imagining me having sex with anothe rgirl, i guess suddenly that lower region looks a bit strange to me like i guess if i masterbate too much that might be part of it, but regardless, my best friends were around and they are good lookin guys and I didnt want to like do anythign wit htem or anything, but whats going on with me? Am i just freaking out for no reason or am i gay or something? ive never done anything wit ha guy except when i was like 4 years old i think which is gross and i couldnt ever imagine myself like being in love with a guy, but when i see two gays together i just feel weird and stuff... I dont know maybe im just worrying to much but I want to be able to have worry free sex with a girl and not have to worry about anything because im talkin to this girl who 2 years ago i would have been slobbering over and now im feeling weird, does sexual feelings change>?
Please help me!