Could I have a slight case of autism?

[CC]

I'm 14 (have CF if that makes a difference or not) and I've always know that I'm... different. I'm not really like most people, and can sometimes have a hard time communicating normally. I was watching Temple Grandin (the movie) and asks my mom if there was such thing as a slight case of autism and she said "Yeah, you have it." and I said "What?" and she said "Just kidding." but I don't know if she was actually kidding or not. I've always been paranoid about this kinda thing, whether there's something wrong with me or not and if there's some reason my parents aren't telling me. Could she have been starting to tell me something but then because of my facial expression and the way I said "what" changed her mind? Serious answers only please. I'm really scared about this. If not autism, I think there is something wrong with me.