Do I Stim?

I hear a lot about autists stimming but I have no idea if I've ever done it or do it now. What kind of things count as stimming?

I chew the inside of my mouth but that's common for a lot of people, I've heard.

I wiggle my foot sometimes and stroke my thumbnail over my Cupid's now (top lip) as it feels really soft. Do those count?

I'm just curious if I've been stimming my whole life and not even realised it.