I'm tall and with really short hair. I've always preferred short hair. But yes, I have been mistaken for a man many times in my life, usually at a sideways glance or not a close look. But as time goes by, I care less and less about that. Just this past weekend, I was doing a mt. bike race, and a few times a passing rider or one I was overtaking said something like, "nice going, buddy," or "keep it up, man," or "on your left, dude." It's kind of funny, to feel like for a minute that I was an impostor, sneaking in on the "world of men", and seeing how they talk to one another.