Might help also to describe what you think feminism is, since it’s one of those terms that is overloaded.
I once had a physical therapist tell me she wasn’t a feminist because she thought women couldn’t be as physically capable as men when serving as soldiers, and seemed to believe feminism requires treating women exactly like men.
I told her I was a feminist because I believe in equal rights for men and women, an idea she did not seem so opposed to.
Don’t get too caught up in nuance and small strains of academic philosophy here. The difference is clear:
Egalitarianism is a philosophy that asserts equality among all people. An egalitarian holds the belief or principle that all people are equal and should be treated equally.
Feminism is a social movement born out of the pervasive and systematic disenfranchisement, oppression and abuse of women, which holds to an egalitarian philosophy of equal rights between men and women. A feminist is an advocate for the equal rights of women.
One is an abstract idea that influences modern humanism, liberalism and democracy. The other is a struggle to make that ideal a reality, that has a different face in every different time and place that it’s happening. Both are virtuous.