Let’s say we are born with a gender identity. Either
(1) it isn’t a binary, in which case there’s no need to change your sex to attain some sort of ‘fit’
(2) it is binary, but it doesn’t necessarily or always align with sex, in which case again there’s no need to change your sex, or
(3) it is binary and it does align with sex, in which case one couldn’t possibly feel a mismatch—feeling a mismatch would just prove that (2) is the case.
I suppose one could say that for 99%, it is aligned, and those who feel a mismatch are anomalies, but look around at all the women who are not feminine. Are we all anomalies? If so, then we’re not really anomalies, are we. (And even if we are, so what? How does that necessitate chemical or surgical transformation?)