Boys who wear dresses, like pink, etc are told they aren’t boys. Do you know what the term for that is? “Gender roles.”
You have it completely backwards. Having a Y chromosome makes you biologically a member of the male sex, wanting to appear female makes your gender female. I could explain this again, but I’m pretty damn sure a basic biology textbook would serve you better.
And stop deflecting to otherkin. That’s still irrelevant.