@taedryn this is difficult for me to answer because I grew up under section 28 in the UK and so beyond the fact that some people had sex changes as told in my parents and media's jokes (solely mtf - trans men and NB people didn't exist) I knew nothing.
Until the age of 10 I just thought something would happen when I grew up where people would stop thinking I was a boy as I become a woman because that was just what I was. Without any knowledge or guidance from 10 on wards was just learning to supress and feel shame at what I felt so that until I was in my late 20's if anyone had said I might be trans I would have laughed.
That it was was even possible never crossed my mind until my early 30's - despite by this point thinking of my child hood as 'when I was a little girl', 'I would be happier as a woman - I should have been a woman' etc. It was only seeing trans people like myself - not conventional pretty or thin - transitioning and being happy that I realised I was the same