Is it really so hard to accept that there is more to the human condition than you personally are capable of experiencing, TTT?
As pixie has explained countless times: XX/XY is sex. There are some technical subtleties, because of course there are -- biology is always more complicated than people learn about at school -- but those can be put to one side*. Then there is gender, which is about how people see themselves and how people are seen within society. The two are different words. Gender is much more nuanced. Mostly it aligns with sex but doesn't have to.
*There are, in fact, "XX men and XY women", in the sense that for whatever reason, even at birth the genetically-determined sex doesn't match the outward appearance. This is separate from, but of course related to, transgender, because it shows that XX/XY is very much not "end of".