Your not the first person to start to be attracted to men after affirming your gender, I think it's more common than we realise. I'm younger but my experience is similar except that I always had a desire to be penetrated since I was a teenager, but I never connected the dots or found men attractive.
As time goes on and I gained some experience like you by living part-time, turns out I really loved it, physically and emotionally.
And now can't imagine being with a woman again except for some kind of threesome
I don't see why sexuality has to be so black and white though, I think most people are capable of some kind of bisexuality, in some ancient cultures it was very common and normal. Today we just repress those feelings from a young age, they are still socially discouraged almost everywhere and bisexuality has the worst stigma because it's seen as a "a choice".
I fell in love with a man for the first time last week, or at least very infatuated and would love for it to get serious.. I was concerned since I hadn't had those feelings in the past but I don't see why that's a big deal, my gender identity was repressed for a while before that too.