That was me, too. And I grew up to be a lesbian who felt kind of too femmy for lesbian subculture when I came out (prefer dresses, love to cook and entertain) and now hate the whole butch/femme resurgence because I don't want to be pegged as either.

I think that there are all sorts of circumstances and personalities that lead to gender-nonconformist behavior. I think having an older brother I wanted to emulate was probably what pushed me that way as a small child, rather than incipient lesbianism, but who knows?