My 5yo boy is officially diagnosed and he is really smart. My father was definitely autistic although never diagnosed.
I was lucky enough to have a false twin brother (11 months younger) that was the most popular guy at school while I was the weirdest (until I started emulating his behavior in social situations).
Today I believe my brain is just wired differently. Some of the most powerful structures in the brain (the GPUs) are devoted analyzing faces and reactions; in my case they are used for other purposes so I had to learn how to process faces using the CPU which is a bit tiresome but works well enough.