Literally every time I read up about Asperger's and Autism it always says that people with ASDs can focus if they have a special interest, and do whatever it takes to learn and find out everything about the subject they are obsessed with.
I've had special interests in the past but I've never become brilliant at them. When I was 12 I became obsessed with Spanish, and I really wanted to speak Spanish. But even though it became my favourite subject in school and I was completely obsessed with it, I still struggled to keep up with my peers in Spanish lessons, and I couldn't learn the language very well. I brought a Spanish learning kit so I can learn at home, but I just couldn't focus - even though it was my special interest! I got so fed up with not being able to grasp my own special interest, that I soon lost interest altogether.
Then after that I got obsessed with these people I knew of, which just got me into trouble, made me look like a stalker, and almost landed me at the police station.
Then when I became an adult I got obsessed with a certain bus company (still am rather interested, but not as much), but my obsession wasn't about memorizing bus timetables or bus routes. It was mostly over the drivers, but even then I had to write (made-up) information down in a book about them because I couldn't memorize information in my head.
So I haven't ever been like normal Aspies when it comes to interests. I hate it when other Aspies think I have a special interest or can find a special interest to become infatuated with and live life happily ever after. We're not all savants, you know.
_________________
Female