Asteria you are conflating sex with gender, and that is part of the problem that children are having these days.
Sex - biology, unchangeable, inherent, observed at birth, your potential reproductive capacity - male/female, boy/girl, man/woman.
Gender - society, changeable, imposed. Masculine/feminine.
Gender identity can not and does not alter biology - your sex is your sex is your sex. We fail children enormously in implying that it does. Toilets are not and never have been separated by gender - they are separated by sex, or not, in which case they are unisex.
We appear to live in times where childhood is saturated in gendered expression, which is unnecessary and can cause untold confusion and distress when rigidly imposed, but equally where others would like us to pretend that there's no difference between men and women at all and equality means we're all the same.
I often find myself pondering what the workplace would look like if it had been set up by women in the first place (or even both sexes, equally and concurrently), rather than women being shoehorned into a set up designed for men, which is still the case.
Rambling now. Will make a cup of tea and attempt to marshall thoughts.