Well that is fine. You can be a liberal without being a liberal activist. You can be a feminist without being an outspoken feminist. You can be an atheist or agnostic without putting up anti-religious signs in capitol buildings.

However, for the sake of rigor, I will point out that simply benefiting from feminism isn't the same as being a feminist. Leslie Unruh, to take one example, is as vile an anti-feminist as you can be, yet even she benefits from feminism. Indeed, you and I wouldn't even know her name if not for the work of feminists and proto-feminists before her time fighting for the idea that people can learn things from listening to women speak.