What Am I Riddles

Question: what does not move outside (the surface)but moves inside ?

Question: I never was. Am always to be. No one ever saw me, nor ever will. And yet I am the confidence of all who live and breathe. What am I ?

Question: What stays where it is when it goes off?

Question: I can't go left, I can't go right. I am forever stuck in a building over three stories high. What am I?

Question: Rarely touched but often held If you have wit, you'll use me well What am I?