How many times have you been called she instead of he?
New concept…. You’ve been called he your whole life I gather, and so have every other person, defined by their gender daily, it’s part of language and identity. Two very important factors, which I imagine are quite annoying to be consistently referred to as the wrong one.
It's never bothered me. People usually apologise. I assure them I don't mind. It doesn't happen face to face nowadays, not since I got bulkier, started going bald and shaved my head. But it still happens on the phone. When I was younger, it happened fairly often face to face as well. I have an androgynous voice and an androgynous appearance when I'm clean shaven. Add in a gracile build and waist length hair and it was unsurprisingly quite common for people to think I was a woman. It's not a big deal.
And no, my sex is not part of my identity. Other people use it that way, including at me, but they can go **** into the wind. If they're not my doctor or my lover, my sex shouldn't be of any relevance to them let alone what defines me. I reject the "they're all the same" belief, which is what biological group identity is.