Looks like a lot has already been mentioned, but I'll say it anyways, they really bother me

Myth: It's ok for someone who hardly knows you to ask about your sex life, your genitals, you favorite colour, whatever, just because you're a transsexual.
NO NO NO! Only people close to me can consider asking me this stuff, even then it's really none of your god damn business! You'd find it rude, well we're people too and it's rude to us also!
Myth: Transsexuals can't be gay/lesbian.
Gender has nothing to do with sexuality, completely separate. I'm a girl that likes girls, just like any other girl can be *gasp* mind-boggling I know.