I learn patience in this forum.
Do you know anything about child development?
An "internal sense of gender identity" is fully established at the time of toilet training. Little boys stand up, little girls sit down. It's that simple.
I've raised two children, I've seen all this with my own two eyes. And my wife is an MD, she's the smart one in the family, she makes me study and learn things.
And, I'm not exactly a slouch myself. There are multiple biology degrees on my wall. I earned them the rigorous and disciplined way. Which means I know a hell of a lot more than any of the kids coming out of Yale or Harvard these days.
USUALLY, the identity follows the biology. Sometimes it fails to develop that way. Which is a medical condition, it's a problem, it means your brain isn't developing right. Dysphoria implies dissociation, it is a medical condition. Dissociation is not found in the absence of an underlying medical condition. AT ALL. Every single trans gender individual has measurable hormonal anomalies, AND, in about 2/3 of the cases there is actual miswiring of the brain, as determined by fMRI.