There is at least one other dragon that you can talk to who doesn't have a bad ending. Just because one got a raw deal in the game doesn't mean the rest did.
My issue wasn't necessarily whether I was trans or not, but whether I was crossdressing or trans. The thing that really solidified it for me was whether or not I wanted to be my gender outside of other people.
Would I want to be a woman putting up dishes, doing my errands, sitting around playing video games. This isn't true for all trans people, especially gender fluid people, but it helped me solidify my feelings.
I had my name first, and only really used my new pronouns with close friends at first to get a feel for it. The biggest thing for me was my partner at the time switching from calling me handsome to beautiful ❤️. That solidified it more than pronouns.