I know I am female because I have boobs and genitalia that are female. I have borne a child, and tried to breastfeed her (body failed). I have female chromosomes. My body is shaped with larger hips and smaller waist, so I look female. I am a Mama Bear, defending my baby from harm much to my daughter's embarrassment.
Part of my work is giving out information. I know I am female because males ask me for directions then ask a male colleague shortly after...to get the same answer. Or males will ask me for directions and then look it up on Google to make sure. Or not bother asking me at all, but ignore my very existence, and walk past me to ask a male colleague.
I know I am female because a manager once asked me if I was going to go part-time after my baby was born, and was visibly shocked when I said no. I had to remind him the baby had two parents.
I am not c*s, or egg provider, or womb space. I am a woman, because I just am.