I'm kind of the same as Rita. One of the reasons my mom has had so much trouble accepting what I'm telling her about my identity is that I didn't really express any desire to wear or do stereotypically "girls" things when I was young. The thing is, I don't think I had a strong sense of gender identity before I hit puberty and it started becoming a big issue. I grew up as a geek, liking geeky things like science fiction and video games, and I had geeky friends, both male and female. It just didn't make much difference.
Honestly, I'm still much the same way in a lot of respects. The thing is that at some point puberty hit and that was when it became really clear that my body was turning into something I just wasn't comfortable with, but deep down, beyond my sense that my body ought to be female (or at least more female than it is now), I don't feel like I fit into the stereotypical gender roles one way or the other. To some extent, my real gender is "geek," which I think there's a good argument for recognizing as a gender (or at least a flavor of gender) in its own right.
I guess in some sense I'm really more "genderqueer," but I'm reluctant to phrase it that way because I'm afraid others will use language like that to invalidate my identity, refuse to call me by my preferred pronouns and question me going on HRT.