People are born the way they are..they don't "choose" to be transgender. Most only transition as a last resort, usually to avoid suicide after a lifetime of suppression and dysphoria.
You will probably find many stories here that can give you insights.
I only found out I'm partially transmale in 2013, and I'm 64, so age has little to do with it. But the dysphoria had been making me depressed, have panic attacks, and was causing such distress I almost started taking testosterone to get relief. In my case, I'm only about 60% transmale and have a weaker female side, but the conflict was exhausting.
I found relief in a local Thai evergreen herb taken in Thailand for back pain. It relieves dysphoria and allows my gender sides to blend in peace.
However, my ex-husband recently emailed me that he plans to transition to non-binary female (he says he doesn't think of himself as a woman, but as "other"), and wants to join me in Thailand, get back together. He wants to take female hormones and grow breasts, dress and live as a female, but leave his body intact.
All I do is to dress androgynously, as I always have, so I don't do anything special to indicate a transmale element.
So, in our case, if this actually happens, there would be two people who have switched gender roles. And I also would face issues you are facing.
I don't know how our new roles would work. I would be perceived to be a "lesbian." I am currently teaching in southern Thailand, and although Buddhist Thai accept a Third Gender and have no problem with gender variation, there are many Muslims here as well. They are tolerant, but it might affect my teaching job.
I don't know if I would be attracted to his body anymore. Maybe I would attracted even more, but I don't know.
I don't know if he will switch to being attracted to males, decide I'm not good enough with my female body, and leave. Since my behavior has always been very male, and our love life was kinky, with much role-switching, he would have to had that element all along anyway.
Females typically run the family, make the decisions, and men just hand over the paycheck and help the wife. She decorates, decides where to go on vacations, etc, and men typically tag along. That's how it was when we were together (except that I had my own job and we started a small company together), despite our hidden opposite gender personalities.
So, now what? I still want to run things, and I don't want my life to become me tagging around behind him (or her). Maybe my ex will also want to run things, if he lets his female side dominate. My current idea is that he can rent his own apartment across the hall from me, and keep his own space, join me at will.
I have lived alone for six years since I moved to Thailand, but he recently remarried, so he would still have to come out, be divorced by his current wife-a staunch religious Republican, who rants against LGBTQ people, find a way to support himself online, etc. so it's a long shot that we get together, but a possibility.
This worried me enough that I began visiting this forum to gain insight from MtF people who have remained with their spouses, and how they worked it out.