Have the people closest to you ever got you really wrong?

It seems people don't know me at all! They say things like I'm very quiet and timid when that's not me at all. My friend couldn't believe I did karaoke last night because I'm shy, and another person thought I lacked confidence because I'm reserved. She also thought I couldn't do boxing because I'd be scared of hitting someone. But I'm a tomboy and really want to learn how to fight, I always have done, so everything people have said is wrong wrong wrong. You ever experienced similar to this?