Surprise and shock! I wanted to be a boy for over 10 years of my childhood. That's a long time, and definitely would have been enough for me to get a diagnosis of gender dysphoria nowadays. (In fact, according to the DSM I still have it!) But here I am, a 48 year old woman, who is happy to be a woman, but still not keen on the bits that made puberty traumatic (periods, breasts, attention from men - though much less now I am invisible middle aged)
Of course it's a bloody phase, and sometimes a long one when being a girl can be quite shit, and gender stereotypes have gone to shit as well.
As an autistic woman I can also see how finding a group that would actually accept me would have been a huge bonus, rather than the lonely bullied girl I was at school. No one can be mean to the trans kids, they are so very extra special and must treated as so at all times (as seen at the schools my kids and friends kids attend)