I never had sisters, just brothers, I always wanted to play the "damsel in distress bits" (you come and rescue me when playing) or "I'm the nurse", it just felt natural, but as I grew up I just had to try and be who I wasn't... Like you I never really mixed well with the boys/men, always opting for strong BFF type relationships with the girls; that has been true right through my life.
Good point Emily, forgot all about Billie Jean King and her work around Gender equality, and of course the furore around Martina Navratilova coming out...
L Katy