Why so many people do accept one of the two socially sanctioned genders (myself included)?

I realised I hadn't given this much thought, and I'd perhaps better. After all, I went through all that bother of transitioning - why settle for something relatively simple and normative, even, when I have had all the possibilities and dislike giving in to the norms, too?

Much as it shocked me, transitioning felt right when I did it. It wasn't just another of those things you do because it's convenient, because it saves a lot of hassle (although it did do all those things, too): I hugely enjoyed, and still enjoy, the results. I know it sounds trite, but this is how I was meant to live. This is the body I really needed to have. It felt physically good. I know, words don't seem convey what I'm trying to say, but it's like getting a proper meal after being hungry for a long time, and not knowing what food is like, even. Something you never knew even existed clicks into place and you realise what a huge, previously unknown hole there had been before.

And I don't know why. I really don't. All I have is speculation and conjectures.

Silly as it sounds, after vaginoplasty I felt whole. Part of it was no doubt psychological - no-one can take me back - but I suspect that wasn't all. How does one describe a body that feels right?

And, to continue the silliness, being a woman in this society feels right. It fits. While there still are very real problems in my life, there isn't the feeling of not fitting in, of not belonging. I still keep wondering if this how cises feel all the time. If they do, let me tell you they don't know how lucky they are.

This feeling highlights, of course, the horror that was living with untreated transsexuality. More on that elsewhere on this blog, and numerous other places - no need to go there now.

[ETA]

The reason why I accept one of the socially sanctioned genders is 'cos it fits. For the lack of better words, it just fits. I guess developing a proper answer to the question in the headline requires a theory I'm not sure even exists - a theory of fitting in, of normalcy. No-one seems to examine that. I wonder why?