I think too much.
I went out and in some wandering found a playground I’d never seen before. I climbed onto the swings and began swinging back and forth. I closed my eyes and tried to just feel the wind rush past me as I went higher and higher, but I was unable to not think about how the swings were creaking and there was a possibility that the support poles could come loose and the swing set could fall. Or the chain was old and could break, spilling me out onto the ground. Or that the chain was entirely not comfortable to hold onto, or that the swing itself crushed the sides of my hips.
When I was a kid, none of this stuff ever occurred to me. I was too busy having fun.