When I was 4/5 and first learned that I would grow boobs and the such, it was my first experience with being furious with being born a woman. I pretty much begged and prayed for 'em to come off or never grow. Thus began a weird transition, non-medical of course, with as much ability as a child that young have. I.e. stealing my brothers clothes, chopping up my hair, general child bratty attitude. It was my big dream to have gender reassignment surgery. Didn't even know the word transgender. I only adopted it when I learned it.
So, in my eyes and experience, only people that have desired to present socially and physically from the beginning are legit. I am not accepted in the transgender community due to these views but I don't really give a shit, no one is going to be able to tell what the fuck I am in a few years.