Is it normal to be bisexual?

For some time I've been masturbating to guys for a while and rarely noticed women (I noticed them and I knew they were beautiful but my focus wasn't on them), which as I got more into it, wondered if I was gay or not. I've thought about being in a romantic relationship with another guy and it really felt uncomfortable to me. But recently I've been masturbating to women as well of which I've always thought about connecting to on a romantic level. My physical attraction use to be low, but now it's even more higher than before. But still not at the same extent at which men turn me on. I have no problem having a friendship with a guy, but it just doesn't feel that right if I were in commitment. Now I'm in a situation where I can't get as erected watching women like when I'm watching guys and I may lose my stiffness to girls...even men sometimes. I keep wondering why everything in my life has to be so complicated. I want more a sexual attraction to women that could equal my attraction to men so I could fully enjoy both worlds and even sometimes I feel disgusted about my attraction to men and ashamed with my physical attraction isn't as high as it is to men. I feel like I've been born dysfunctional. I don't understand why my sexual attraction isn't equal or could it be... Sometimes it feels good thinking about being with a guy friend but it ends up hurting me mentally because I don't have that same level of attraction to girls.