There is also the diagnosis Pervasive Developmental Disorder Not Otherwise Specified. There have been recent changes, but I remember the category Pervasive Developmental Disorder starting with the not otherwise specified and going up to Aspergers and then finally hitting Autism. It is a sort of spectrum depending on how many of the characteristics a person has and how severely. Most of the characteristics seem to be about being withdrawn and having difficulty communicating with other people. I also took that particular quiz and scored fairly high on it. I think I got a 30 on the test and the intermediate range was something like 30 to 33. It surprised me how narrow that was. The test is for your information. It gives you something to look into. It is not a diagnosis. To be fair, though, I would have to say that in my case the test was fairly accurate. When I was a little kid I told the other kids at school that the reason why I couldn't learn their names was because I couldn't tell them apart and only rarely was someone interesting enough that I could learn to consistently recognize them. As an adult I have the same problem every time I change jobs, but at least I don't tell them they all look alike to me.

As for advice, I would suggest reading about Aspergers. You can see how familiar the symptoms and experiences feel. That's a good place to start before you decide to do something about it.