Is it normal that i'm confused of my sexuality?

I have a sexual attraction to men who only falls under a sexual fetishism (fat fetish) and yet I have no real desire/lust for any other parts of their body, no real sexual attraction to penis, nor for a strong desire to kiss the person. If fact, when I think about it, If I were to ever have sex, I'd be completely submissive and wouldn't even think about doing the same things (dominant) he's done to me (Like me receiving head or me "giving it" to them. I'm only sexually attracted to their feature which revolves around fetish.

I have an emotional connection and interest in women, yet I have trouble having just as strong as an erection I have for my fetish for guys weight. I have absolutely no disgust/problem for sexual thoughts of women and would be willing and wanting to have sex with them. I always been interested in girls and have masturbated and got off to straight porn, yet the feeling wasn't as strong as the fetish and sometimes just have trouble getting it up when thinking about it. Still, when I feel comfortable and confident, it's more easy to be aroused.

Bisexual? I also believe I have Purely Obsessional OCD, since I have been obsessing over this since June and I've had multiple unwanted thoughts and images in my head.