Midgebabe
"dadjoke so you are saying I don't notice my gender identity because I am well matched? And I think you also said gender identity was immutable?""
It's innate rather than immutable. Think of sexuality.
That does not tie with my experiance. As a teenager I identified as a boy, called David. If today I wrote you a short sketch of myself, you would probably think I was a man. People from other cultures who do not recognise my name as female assume I am male. Can be amusing when we meet for the first time.
That's because your gender expression is that traditionally associated with men. That's an oppressive social construct.
Unfortunatly the shape of my body meant that I couldn't get away with that. So I grew up and accepted my sex is a woman but beyond some obvious biological features being a woman is completely orthogonal to my identity.
I suspect that realising that your body is just fine as it is and that only stupid people apply gender sterotypes or let them restrict what you do is a much healthier approach to this than saying my body is wrong and I am a man really.
But if you want to tell woman that they are wrong in what they think and feel, well that tells me all I need to know about you .
Because of societal pressures to conform to gender stereotypes, we often think that it's us who are wrong rather than society. Many gay people denied their sexuality before coming to terms with it. Because we wrongly expect gender to be expressed in a certain way, instead of accepting our gender, and expressing it how we like we try to twist our gender identity to match our gender expression even though it feels wrong. It sounds like in your journey, you came to terms with it, and now you are happy in your body as a woman.
The visceral rejection of the concept gender identity is based on the visceral rejection of gender expression - but one is innate and the other is not.
If I say you have a sexuality, I am not telling you how to think or feel. If I tell you you are gay when you are heterosexual, then I am.