I told my mom while she was visiting me this past week about my AS. She wasn't a bit surprised, being as she and other people in our family have similar traits. Her main point was that everyone has something to deal with and there's really no such thing as "normal", anyway. I think it also answered many questions she's had about my behavior.
It would be a good idea for you to tell your parents about your Asperger's. If anything, they'll have a lot of questions about AS you'll have to be prepared to answer. Now you say you're in college? Apparently, you're an adult and however you do in school shouldn't be that much of an issue to your parents anymore.
After all, college is supposed to benefit you, not your parents and you're the one who deals with the consequences of however you perform. You may want to seek out services that can teach you methods to use in class so you'll be able to concentrate better.