What if all children are naturally inclined to "feel like boys", whatever that means. But then society dictates that some are "girls" and are put in dresses, hair plaited, and told to behave a certain way? Why wouldn't they feel uncomfortable with their assigned gender role, regardless of what's coming for them in puberty?
https://books.google.ca/books?id=bEycBQAAQBAJ&pg=PT161&lpg=P...
But it were the case—if every young (apparent) girl felt the same unease about their gender—one would assume that the people in the town would have already acknowledged that. They seem quite comfortable discussing gender.
Funny how once their penises start growing they're accepted for the boyishness, but the "real" girls are stuck in their shitty gender role, and few people note the hypocrisy.
Sexual dimorphism is weird. There must more to it than sex hormones.