What does it mean to be a woman? It means you've been lumped into - and/or lump yourself into - a social construct used to describe, proscribe, circumscribe, regulate, oppress, stomp all over, play games with, stare at, get excited over and expect things of half the human population.
Thass wot it forkin' means to be a woman.
Not a comforting answer, but a liberating one, I hope.