Thanks for your input guys.
The most mind-numbingly hurtful aspect of all this is that I'm currently in a very serious relationship with a non gender binary person. I view them as more male, even though they don't identify more with one gender than the other. They're also aware I'm this lost considering how I'm still pre-everything and they can see and feel my frustrations with feeling helpless cos I don't have all the answers about myself. I'm the guy that usually prides himself on having a plan, but it's like having an inner government overthrown. Nothing is certain anymore and we've been working through this together, with me admitting I'm very attracted to men, have been through several situations where I've seen evidence of that attraction, and also have fantasies involving men.
All the same I don't want to put my partner through the pressure of identifying themselves as male in order to be with me. I'd never pressure them to go in that direction. We also both want to save the friendship should things get to a point I have to admit to myself I'm a 100% gay. It feels I won't know 'til T definition gives me more clarity, for now it's all questions, pain, and self-flagellation. I'm not one to be dramatic but it's been hell. Rage issues have gotten worse since.
What Rory brought up about the dysphoria being about me feeling like a woman around men, it's spot-on too. I worry that even once everything's done (for me that'd be getting used to hormones and top surgery) I'll feel like a chick around dudes I'm into. That's probably paranoia and self-deprecating anxiety. I'm a really confident person but I get I scrutinize my own lack of knowledge about how things will be when I'm finally myself, which I haven't been for 25 years.
There's more questions than answers and it drives me bat->-bleeped-<-. All I can do is hang in there and be truthful to my partner about all of it. We're like twins and we support each other no matter what, but I'd like to have a chance to find some sort of help for the both of us while we go through all the steps this transition brings into my life. We're in it together.