I never really developed any special interests until I was about 10. I had a sort of obsession with books written by Beverly Cleary throughout elementary school, and reading them are the only memories I have of the things I did for fun at that age. I don't remember what else I did at all, so maybe it was a bigger interest than I was aware of. I have kind of the opposite problem to you at the moment, Wags: I'm developing new interests so fast I can't keep up with them, and some of my older ones are getting shoved to the background. Right now I'm interested in Star Trek (definitely shoved to the background), dinosaurs, ASDs, and my most recent one that caught on a couple of weeks ago, the X-Men. I wish I could just focus on one interest and tune the rest out, because stretching my time over so many interests dilutes the number of things I'm learning about each one, as well as their general potency. I came close to being "interest-less" in 12th grade as my Peanuts cartoon obsession of five years began to wane, however near the middle of the year, it was replaced by Star Trek and I started fresh with a new interest. The trick is not to let your lack of interest depress you, otherwise you'll lose the energy and motivation to do things that might spark a new one. Keep looking around for things that seem interesting, and see if anything sticks; that's how I developed my interest in the X-Men; I sort of poked around the internet for an hour or so, not really expecting much, and before I knew it, I had another obsession on my plate.
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"Survival is insufficient" - Seven of Nine
Diagnosed with ASD level 1 on the 10th of April, 2014
Rediagnosed with ASD level 2 on the 4th of May, 2019
Thanks to Olympiadis for my fantastic avatar!