I am a 50+ amab, married 25+, with 2 kids, and an established life for personal, faith, and profession. I exude white male privilege.
I've only been actively dealing with my trans nature for 3 years, but I have been the way I am my whole life. I can remember actively questioning my gender in my teens - but every time I thought for sure I was female, I'd run into something that would make me throw that conclusion out. The 70's/80's were a very binary time to live in. The biggest revelation to me when I started therapy was that gender was fluid, and that it wasn't like a light switch. If I had that concept available to me in my youth, I would have had a lot less confusion.
When I first came to the conclusion that I was non-binary, I figured I was gender fluid. For sure this concept made it a lot easier to explain my situation to my wife and for her to absorb it - after all, there was still a male part to this identity.
As I have gone on, I recognize that even if there is a male piece there, I spend the majority of my time somewhere on the female side of the scale. With that, I now know myself more as trans-feminine.
The long set-up brings me to your actual topic of doubt. I know me, but what I don't know is how much of what I feel on the male side as a child was me accepting the expectations I thought society had for me as amab. Now that I find myself actively dealing with things as a 50+ person, I ask myself how much is me really having a male side, and how much is just 50 years worth of muscle memory from acting male? I don't have an answer for that.
What I do know is even on lower doses of HRT, I am happier than I have ever been. I've had fears over going on higher doses - most of those have to my role in my marriage and my wife's feelings. My wife has not been full on cheerleader supportive but she not been the exact opposite either. She loves me and is working with things as best she can. As long as that is happening, I am going to keep doing my best to find some kind of middle path that we can both be happy on. I am not always sure how long term successful that will be and we've talked about it. The important thing is that I know she appreciates that no matter how hard, I have tried to make it work. I am pretty sure there is a part of her that is starting to accept that I might ultimately fail - and she has not shown any signs of running the other way. And my HRT has crept up along the way.
I'm really not sure if I addressed your actual question. This is my first post in the NB area, and I may have shared much more than was needed.