Kinda Weird... idk
I'm a girl in upper teens, with a steady boyfriend (3years) we have sex regularly, and it's great. aside from that i look at pics of lesbian porn and masturbate to it. I don't think it's really the women, because i never see a girl and think "I'd fuck her" i mean i'm not gay, bi..etc. i honestly think it's just seeing body parts that are similar to my own and imagining being touched where they are... idk. And it could also be that i don't like looking at other penises because it makes me feel like I'm cheating. it may sound weird... but I'm so serious. everytime i see one i feel guilty.
No reason to feel bad. Have you ever thought of asking your bf if he would like a FFM threesome? He would be there so you wouldn't be cheating. You will also have a chance to see where your desires lead. You could find a lesbian if you don't want your bf to fuck her. Look for opportunities to bring it up to him. Good luck
Don't deny yourself more penises because of that social construct that is monogamy. You were born to enjoy life in all its varieties. Not to settle for one single dick your entire life
Watching porn doesn't always have something to do with your actual preferences. Just because lesbian porn turns you on, doesn't mean that you're a lesbian. I watch all sorts of weird shit that I have no interest in actually doing. Porn is all fantasy. You should let it be an outlet for yourself, regardless of what it is that turns you on. If it gets you off, who cares what it is? Like I said, it's all fantasy.