Haha, ohmy. Thats happened to me many many times. Infact I don't even care anymore, if someone thinks I'm a male, so what? :P but I have to say the funniest time was when I was walking down my school hall to use the bathroom, I took the first right. which was the boys bathroom. I didn't notice until guys came in, and they were like "Yo bro. You new here? I'm Josh.."