@adiz but it's not a social construct. Gender comes from two distinct biological and mental variations. There might be infinite ways to exist as each gender, and exceptions to everything but walk around anywhere and you'll see that people do tend towards one variation or the other.

Now add in that a developing fetus starts out as female, that's why you have nipples, and you're connected with your mother the whole time feeling her hormones and emotions as a subconscious part of your own. It's only later in development that the Y mutation kicks in and changes the body from a females to a males. There's lots of ways for the brain and the body to develop before that happens, and you can end up with a baby who feels more empathetic, more sensitive, and more like the mother despite having a male body, and later in life that can even result in high estrogen and low testosterone, breast tissue development, etc because the body never got the full signal that it should be male. Meanwhile it's pumping testosterone and the brain doesn't know how to function on it, until you change the hormones and socially transition and things become as the body was starting to initially in development. Then things like depression melt away, life expectancy skyrockets etc.

Like yes there's an extent to which that is all social and you could be whoever you want to be and you make your own meaning etc but there's also an undeniable reality to the fact that many binary trans folks had to transition because we got the initial recipe all jumbled up