Autism is a bit more than that.
It involves sensory sensitivities. It also involves social interaction as something which must be "learned consciously," rather than as something which "comes naturally." And it involves things which are more complex that have something to do with the autistic person's neurology.
As for the shy neurotypicals, there are other reasons for their shyness than their lack of ability in social interactions. It's not that it "doesn't come naturally," it's that they are anxious about social interaction, even if it does "come naturally."
And I don't believe autism should be seen in a negative light at all. There are certain advantages, in some cases, to be autistic versus being "neurotypical."
There are autistic people (e.g., Temple Grandin) who can see things, visually, from a viewpoint "neurotypicals" are unable to conceive of. This is why Ms. Grandin was able to invent a more humane way of vaccinating farm animals. She was able to see things from the viewpoint of the animal, rather than merely from the viewpoint of people.