Hi, Miranda.
I get it: I am similar, though a few more years down the road than you. Yes, it is frustrating, I remember.
I had a repressed upbringing with regard to sexuality, and being unknowingly trans certainly didn't help matters any. I never did figure out sexuality.
With a more normal upbringing, I might have been lesbian. Certainly that is where my attractions lead. But, in practice, I am asexual, and I embrace the term. It gives me an accurate way of describing myself, other than "weird".

Getting married was difficult for me. I was in my mid-40s when I met my wife. We had a natural chemistry, which was good because I sure didn't know what I was doing.
I am now 64, my wife is older, and my married sex life has been on hold for a long time for reasons that have nothing to do with me. I was sad about that for a while, but it is what it is, and I have long since come to terms with it. And, no, I never looked elsewhere.
I think there is no sense pining for what is long gone. My life is good, and I am in a way better place emotionally than I ever was when I was sexually active.