What is wrong with me? My friends think I am autistic...?

I am not socially akward, but i say weird thing on purpose at waitresses, my friends, etc. I am completely aware when i do this excpet for when i sometimes call people scooby doo without warning. Along with this, the fact that i can recount every dbz saga, hp book and have a gift at music my friends have come to the conclusion that i am autistic, whats really wrong with me?