I am not trans, but I was more than a tomboy. I wanted to be a boy from a very young age and had even chosen the name I wanted to be known by. Even as an adult I have been accused, in the past, of 'thinking like a man', whatever that might mean.
I am incredibly glad that there were no adults around encouraging me to think I might become a boy because my body is that of a female heterosexual, although I have always been very grateful for having small breasts. One of my worries when I was going through puberty was that my breasts would be as large as my mother's. perfectly average sized ones.
Personally, I am glad that the only option for me was to integrate what I was born with rather than seek to medicalise myself to try and convince myself I was physically what i was not.
Many years ago my sister worked for a small heritage organisation where her boss was in a female gay relationship. Her partner, however, always dressed and presented as a man,
Nobody was bothered by it. Going about her ordinary life where her sex was irrelevant, she was seen and treated as a man, as she was in the work and social world she lived in, where everyone knew what the circumstances were.
I think she was far more integrated and accepted than many of those who nowadays seem so determined to make a big song and dance about being trans.