I dont really understand bisexuality?

Ever since I was little I've always wanted to be with women I was attracted to them and still am. I never had any homosexual thoughts growing up until I dowloaded some gay porn. In highschool I was this with this girl forfive years and I started developing anxiety that I might be gay but she always told me honestly she didn't think so. she always told me that I wasn't gay and that I might be bisexual. I continued to look at all sorts of porn including tranny and gay porn. I then started to have sexualencounters with guys and I had fun but I was never fully into them like I always felt like it was purely sexual nothing more. A couple of times they tried to kiss me and I just didn't want to like I could do everythin else but that. I was also having sex with women and a couple of times the sex was ultimately amazing! I would also naturally prefer to be with a women. As far as dating a man its something I've never wanted. Ok so what I don't understand is if I'm bisexual. Wouldn't I be interested in both romantically? How come I only want to be romantic with women but only have a sexual thing with usually gay fem guys but I've got a bj from straight looking guys.I think when it comes to guys its just a sexual thing. I will admit I'm not open about this because some people won't understand. But anyways that's how I feel what do you think?