I agree with jimrat. I have mild Asperger's and social anxiety disorder. So not only do I have difficulty understanding relationships, I fear them on top of it. Despite this, I'm probably a bit better at things like reading people's facial expressions and understanding metaphors than the average aspie, but this doesn't mean I don't have AS. It's a spectrum, after all.

This is the way I visualize the autism spectrum. Think of a swimming pool that gets gradually deeper. I'm at the shallow end, up to my ankles in the water because my case is mild. Further down at the end of the pool are the most severe cases of autism, those that have the worst difficulty speaking and learning. In between are people with many varying degrees of severity.

I hope this helps. It's how I think of it, anyway.