Your stimming habits?

Mine is genuinely destructive. I scratch my walls so that the upper layers get in my nails. Then I rub my hands together so that a clay thingy will form, which I then dust off. My nails are gone and so are my walls dude. I tried stopping it, but I just need to feel something falling off from my skin for some reason. Anyways, what are your stimming habits?

[For those who are unaware, stimming refers to a repetitive action you do during times of stress or anxiety. This definition maybe wrong since thats my understanding of it.]