I'm pretty much constantly stimming in one way or another (at least). Sometimes I'm aware of it, sometimes not. Oftentimes I will only become aware of it once I've been doing it for a while, unless it's particularly vigorous. My most frequent ones are rocking back and forth, flicking or shaking my hand (for some reason, my hand stims are almost always with only my left hand), humming, whispering nonsense, making a kind of snarling noise and jerking my head, breathing extremely rapidly, and pounding on my chest, and any small object near me, like a pen, is probably going to be fiddled with. I also have one of these, and love it. When I'm very excited, I will involuntarily start to flap my left hand. I'm aware of it, but I can't stop it until I've already started.
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Yet in my new wildness and freedom I almost welcome the bitterness of alienage. For although nepenthe has calmed me, I know always that I am an outsider; a stranger in this century and among those who are still men.
-H. P. Lovecraft, "The Outsider"