Answer:
Everyone has me except for a few. You may not be able to identify me but I can always identify you. What am I?
The shorter I am the bigger I am.
I fill a room but take no space. What am I?
What is shaped like a box, has no feet, and runs up and down?
You kick me, you punch me, and you beat me up all class. When you leave, you don't even say thanks for allowing you to beat me up. What am I?
What kind of dog has no tail?