First off, I'm glad to hear that you and your gf/soon-to-be-wife have worked things out (I didn't know there were issues until now but either way). I also think it's really awesome that you have found out more about who you are and what makes you comfortable.
Honestly, I see what you're getting at with the whole stress thing. Something that's really hard for me is worrying that I'm going to be outed, constantly. I have a lot of people who know me from before, and while many, I think, are respectful enough to keep it to themselves, there are some who would not hesitate to tell others in conversation. I also worry...well, I do pass very well at this point, but there are a few people who can "read" my features so again I worry about those types of conversations and possible confrontations.
I think if you can get to a point where it matters less to you, more power to you. I've often wished I could feel OK with that - with not caring if people think I am male or female, if they know I am trans, etc etc. Not because I identify as non-binary, per se, but just because there's a lot of fear that surrounds trying to be stealth. It's hard because I want to be seen just as any other guy, nothing special, nothing different, just your boring regular dude. Those two desires - to be free from fear of outing/discrimination, and the desire to be...well, me (a guy), they fight a lot.