Jessica, I would have asked your lady friend what she thinks makes a "good" woman, because really, it's a silly comment. She can't know how you feel on the inside, and that's what really counts. Going out and feeling comfortable is all about self-confidence, which has nothing to do with "passing," which I believe is what your friend was trying to say.
Most of us don't pass, but that doesn't mean we can't be passable. It's all about how we carry ourselves, which includes good makeup and fashion sense, combined with feminine poise. Concentrate on those items, and by all means, you should venture out.
Hugs,
Sally