As a kid my special interest was mainly Beyblade (also Pokemon and Yu-Gi-Oh! cards) , I had every single one of them, even asked my parents to let me order the newly released Beyblades from Japan online. I loved putting all my Beyblades on a line and then looking at my collection, it gave me a feeling of euphoria. Then I rearranged them, and put them all on a line again. That was how I played with them, I rarely did battle.
Beyblade stayed until I was like 13, then a new, very bad special interest got into me. It was drugs. I had never done any drug before, but I was extremely interested by all the possible effects from every different kind of drug, and I felt an extreme urge to try them all. So I did that, and the first one I tried was speed. It made all my social difficulties disappear and I got addicted to it. Pretty soon afterwards I had tried every kind of drug there is, the last one being heroin. Ofcourse my life spiralled completely out of control because of all this drug use, but that's a story for another thread. I have now given up this special interest, although I still love reading about it and still smoke weed. And occasionally feel like using something else, but I resist most of the time.
My latest special interest is bodybuilding. This sport requires a great deal of discipline, but also routine. And I love routine, when I'm living in the bodybuilding routine I feel very relaxed. Lifting heavy weights also releases alot of endorphins in my body, which helps when I'm getting stressed out. It also helps with self confidence alot, because now I'm no longer afraid of being bullied by males, as I can easily beat them in a fight.