Cute elephant avatar
.
I wonder if this is just your parents way of coping with the diagnosis. They're probably anxious about being 'Good' parents etc. and grasping at any support they an get. It may settle down over time as you grow up and they grow used to it.
Also, maybe consider the idea that the books may help. Your parents aren't stupid; you're still their daughter and not some cookie-cutter aspie from a text book, but if they are having trouble understanding you, these books may help them at least feel as if they are doing something (same way Wrongplanet is a support for you).
Parents buy books about their kids all the time. It's not just because you have AS. There are also books about how to understand your boss, your teacher, the examiners, your partner, your doctor etc... all these books have a slightly patronising tone about the person being 'understood', as if they are manuals for understanding some delicate foreign species, but they're just guides, and what matters is the mentality of the person who uses the text.
(but yeah, I hate books that only refer to 'he'. It's even worse if the author makes a little throw away caveat beforehand about how of course by 'he', they mean she as well, but it's just soo much easier to read this way... yeah, like that's worth alienating half your target audience)