Please read these two posts by Renee prior to responding...
Womanist Musings: I am not a Feminist
Womanist Musings: Can a White Woman be a Womanist?
I agree with commenter "juju" who said "ultimately, the work that you do is much more important than the label you wear, and you should just call yourself whatever works for you and continue doing the work." I understand and agree with focusing on activism but often identity fuels a social movement and propels it forward with greater force. I would hate our progress and activism to slow because we're too busy focusing on what our identity should be.
I wrote about this a bit in my "I'm not a feminist, but" post: George Washington University’s Dr. Zucker (2004) published a study addressing this. Dr. Zucker’s research explored women disavowing social identities and found that in the 272 women surveyed, self-identifying as feminists was a predictor of feminist activism. Herein lies my concern. On one hand, I don’t care if you identity as a feminist or not, as long as you retain feminist beliefs. On the other hand, if self-identifying as a feminist is going to make you more of an activist, then it matters.