10 Years Of Confusion

Hi guys, I need some guidance and I just don't know what to do.For 10 years I have been trying to come to grips with my sexuality and everytime I think I've got a handle on it, something always prevents me accepting who I truly am. I've been using gay forums and porn sites for years now, constantly looking for some sort of sign of who I really want to be with. I'm 25 and I don't want to waste another year of my life being unsure about who I really am. I'm going to tell you a little of my story and any help would greatly be appreciated.So to start of with I grew up with a pretty normal upbringing, I started to date girls in primary school and everything seemed pretty normal. Around the time of my 13th birthday I started to notice I preferred gay porn and aroused looked at naked men, after I finished it seemed I had no interest in the porn or men I had just watched. I would go through phases of watching no porn or I watched lesbian or straight porn. I would then go back to gay porn and the rush and how sexually aroused I became was much more intense than the other porn I watched. I must also say that when it comes to porn, I find it hard to find exactly what I'm looking for. Ideally it is a feminine bottom being dominated by a hunky top, I even revert to straight porn when I can't find what I'm looking for ad imagine I'm the female.On my 17th birthday I thought I had my mind made up, I thought I knew for sure I was gay. I even emotionally came out to my sister and I thought finally I could on with my life. However the trend continued and again I wasn't sure if it was just a phase, I recanted on on my coming out to my sister and told her it was just a phase.This pattern has been going on for ten years now and I just don't know what to do. I'm 25 and in the prime of my life, I don't want to keep going on like this. I haven't had sex in years, so conflicted am I with what I want.Sexually I know I like men more, romantically I don't know. I've had girlfriends and I have loved them, I have had multiple sexual encounters but I have never been able to preform with a woman. I notice girls more than guys in day to day life, but when it comes to watching porn or fantasizing it's men that get me going the most.I know people might say just identify as Bi-sexual, but I feel it is more complex than that. Even if I leave it open ended, I feel that parts of my life will be sexually okay and parts of my life will romantically okay. I'm hoping that some people have been through this and can share their stories.Any help would greatly appreciated