Interesting fact: You don’t get a chromosome test at birth, so most everyone doesn’t know their own chromosome situation. And even if they do, after a costly and usually unnecessary test, there is no reason for them to tell anyone else. It is highly unlikely you have checked yours, and if you did, that would be your private information. And the so called “sex chromosomes” don’t come in only two combinations anyhow, as you admitted. Plenty of people never find out that their chromosomes aren’t in the combination that they think is most likely, or only find out after a fertility study. And they don’t suddenly change gender when they find out their unexpected chromosomal gender.

In short: Your argument isn’t really based on fact. Think different.