Then what of these people that are born with XY genetic makeup, some go on completely unaware of their genetic makeup living lives as women?: https://novonordiskfonden.dk/en/news/more-women-than-expected-are-genetically-men/

LOL, that article says right at the top that these XY people learn that something is amiss during puberty. Coz, you see, menarche is a thing that girls & their parents are well aware of and acutely on the lookout from about age 10 on. Maybe if you knew anything about girls & women, our physiology, our development & our life experiences, you'd realize this.

The average age for girls to get their first period is 12. Which means many get their period at 10 or 11. Some start at 9 or 8; only a period before turning 8 is considered a sign of "precocious puberty" in girls. 98% of girls get their period by the time they turn 15. Girls talk about their periods amongst their friends and female family members - so most girls are very clued in to which of their friends & relatives have started menstruating already, & who hasn't. Sometimes girls being out of sync in this regard can lead to jealousies & rifts in friendships snd amongst sisters. For example, when I first got my period shortly after turning 11, my closest friend got very angry coz she was 15 months older and hadn't gotten hers yet.

Any girl who turns 15 without having gotten a period yet will be very aware that her situation is highly unusual, and she'll likely be extremely worried that "something is wrong" too. Socially, she most likely will feel awkward & "left out." Some other girls who know her situation might be mean to her as a result. But the girl herself will be acutely aware that something is off.

It's total bullshit that there are whole lot of XY people who truly believe themselves to be female who've gotten to adulthood and beyond "completely unaware of their genetic makeup living (their) lives as women" and never questioning their sex when none of them have ever had a period.