At the root of the issue for me is how do you believe/feel you are a woman "in your heart and brain" without experiencing ALL of the following as a possible reality for you: the fear of rape, the fear of being easily overpowered by violent men, the fear of pregnancy, abortion, periods, PMS, gynaecological phenomena, breasts (including your relationship to them, fear of breast cancer, breast cancer, mastectomy or the the idea of it), social pressure in terms of aesthetics (regarding curves, body hair removal, surgical enhancements, cosmetics), undermining in the family, school and workplace as a direct result of being female, lack of employment opportunities and equal pay, motherhood (physical changes, labour, breastfeeding, childbirth) but also non-motherhood (dealing with complicated feelings or social challenging around this), the mental load, the menopause, social conditioning towards kindness, self-censorship out of fear of physical reprisal.
Have I missed anything?
For me, all the above is what it means to be a woman as opposed to a man.
And I genuinely cannot understand how it would be possible to feel like a woman without having EVER been shaped by these factors.