I have had entire mental conversations with myself.
Since I was little I've had a habit of picking at any calluses on my feet. Or hands. And just picking at anything that isn't a scab.
I tend to fidget a LOT.
When I'm excited or impatient I bounce my leg. When I'm anxious I walk in place. When I feel happy or contented I sway or rock.
I talk with my hands a LOT.
I doodle very often.
And I tend to pace just whenever.