Hmm complex, or maybe simple and your over thinking it. Im bi always have been as long as I can remember, but its not 50/50 it ebbs and flows at differenct times of my life. Im attracted to a person not a gender.
I mostly have only had casual sex with guys and relationships with women, them being the nurturers it came easily, I convinced myself that I couldnt have any emotional relationship with a guy for fear that would make me gay instead of bi I think. Of course I was young and confused, I would be proud to be gay too if that were the case, but it simply isnt.
I have a female partner who Im out to but prefer to keep it to ourselves, not that I give a fuck to be honest any more, Im over it after a long long time. Thats strange that you dont think about guys at all when your with a girl, I was never like that, it was always there.
I was never unhappy in my hetro life, prob more frustrated, now Im out and we have established some ground rules Im pretty much where I want to be. Ive also been taking some advise from a shrink who tells me its ok to feel emotions for a guy too, my world wont fall apart
I would say just go with the flow you seem like your up for the journey, guy/chick doesnt matter who you end up with as long as your happy. Just cos its been girls in the past doesnt mean it wont be guys in the future, the ebb and flow of life. Be very careful with the guy with the chick been there done that it ended badly (for me)
I agree get your own shit together first, dont worry mate there are plenty of us like you dont beat yourself up over it, its cool to be bi.