I and my siblings are white skinned, although our great great grandmother was black. Despite my skin colour, the official law in other times and places would have forbidden me to own land or to marry a white man, because of that evidenced heritage. I certainly have an interest and romantic fondness for this ancestor of mine and what her story may have been, and I know of some members of the family in previous generations who rejected her memory and tried to cover up her existence, including destroying pictures and records.
Do I have the faintest idea of what it is to be alive in a body that isn't white? No. Not the foggiest. I've never experienced racial prejudice in my life and never will, because the plain fact is I am white. That is my fact, it is what it is.
I could, theoretically, explain that my race is on a spectrum, and I could explain my sense of identity as a black person inside, and my feelings and other things that are all about me and the importance of me- and whatever germ of reality may be in that, it would be outrageously insensitive and offensive to someone who is black and whose reality is living in that body without it being a choice under their control, and who has the lived experience that white people cannot share in. They can read about it, think about it, emotionally get involved with it, embrace the language and culture they feel connected to, but it's a romantic third hand experience of what they believe it may be like.
Incidentally the choices around race often appear to be 'I want to be part of', more than 'I want to suppress and replace'. Which sometimes is not the case around sex. Interesting to reflect on.
As a side note: if race and sex are choices, age will have to be too. That is inevitable.