All my childhood (*and* I wore skirts - no jeans in those days).
In my 20's I wore the usual looney-feminist uniform and the question then as if I was a "sea retaining wall" or not.
I enjoyed the androgny actually (tho' I felt embarassed as a reflection of the embarrassment of the other person who had made this "horrendous" mistake).
Has happened hardly at all since I was 30 - must be something hormonal or pheremonal.
Still *feel* the same ie human of yet-to-be-determined gender.
I read something once that there is a multiplicity of gender-determining indicators eg chromosomes, self-image, hormonal balances, physical "parts". So I personally think I have some contra-indications in my body/blood/brain/heart
Tho' I did feel more obviously a woman when I was pregnant. And then I thought "Ah, so *that* is what "they" have been on about all these years!"
It was a pleasant experience to be normal ie what people expect ; tho' I suspect if it had gone on for too much longer it would have begun to pall!!