That sounds exactly like me, but I doubt I have any form of autism. I have wondered about it in the past, because this is not the first time I've related to autistic people's thoughts, but I have also not related to a lot of it, so that gives me major doubts. I know some autistic people need to do stimming behaviors, it kind of reminds me of odd things I've done since I was a small child. I would always use my fingers or other body parts to draw invisible shapes over and over again onto myself, for example, I'd use my thumb to outline shapes on my inner fingers of the same hand, or my index finger to make shapes on my knee if I was sitting and other variations (the shape is always the same, a circle and a cross inside of it, and an X on top of the cross - sometimes the cross and the X are switched). Also flexing muscles like calf and arm (not bicep like a bodybuilder, this is without moving any limbs, just sitting still) and jaw clenching, and since I've always used a desktop computer (and absolutely prefer to even today over tablets or laptops), I constantly right-click my mouse all over the screen on every single program, it's more satisfying if the popup menu is bigger, if nothing comes up it irritates me, and I hate those websites that disable right-clicking, can't stand them! Not because I want to use the pop-up menu, it's only for the sensation I guess, I don't know it's just a habit, and I do it repeatedly and rapidly.
These things have been going on my entire life and for as long as I've had my own computers, and I'm 35 now, I'm right-clicking right now while sitting here. There are many other weird behaviors I've had my whole life but it's too long to list and explain. I still don't know what or why I do them, and I've never really told anyone (well I have tried explaining to a psychiatrist in a psych ward when I was 14 but they weren't paying attention to me and diagnosed me as depressed and ignored me, and when I was 8 I had a verbally abusive teacher who made me take a hearing test because I wasn't paying attention in class, I've also been placed in ESL once even though my first and only language is English) Maybe it's ADHD or something. Who knows, it's not like I'm ever going to be taken seriously by a doctor from where I live, where there is a shortage of doctors and the healthcare system is hopeless (Canada, recently had a family member die because of how crap it is). Plus I'm an addict dependent on opiates and so pretty much all doctors just blame it on that, and treat me like I was born the day I started using drugs. No one cares to know about my childhood. So I gave up on healthcare a long time ago, I only see a doctor now for methadone and that's it. I won't even go for a rash or infection, unless it's a dental problem. Anyway, sorry for my rambling.