My own current explanation of my pronoun preference:
As a radical feminist since I became aware of radical
feminism in about 1981, I have, for most of my life,
identified with women. Only recently I have
begun to feel I have the right to identify as
a woman (and genderqueer, both of which I owe to the struggles
of trans activists.) Since I continue to look and sound
like a man, I am generally presumed male and benefit from male
privilege. I don't use women's restrooms, not wanting to
make other women uncomfortable. I have just begun (2020) to
mark myself female on official forms, but do not want to
take advantage of any special programs or recognition won
by women in our centuries-old struggles against misogyny,
patriarchy, and sexism.