I have never been diagnosed as such but have come to same conclusion for myself over a number of years. I thinks some indicators:
- get on better with things than with people, even get emotionally attached to inanimate objects more than people.
- able to focus intently on mental games for hours, but get bored quickly making idle chatter with people
- Love "ticking the boxes" collecting and filling gaps in a collection. Love sequences, similarities and differences in a collection
- can remember facts about things - periodic table, history, coins etc - with no difficulty but forget people's names in an instant.
- find "unfinished business" intensely bothersome.
- have to focus to be understanding and tolerant of other people's faults, but can't see the problem with my own!
Anyone else tick a few of those boxes? 😁