What Am I Riddles

Question: What is something that you always have with you but you always leave behind?

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: I had a bright start,
but I couldn't take the pressure.
I consume everything,
yet I don't eat anything.
What am I?

Question: I am in everything and in nothing, what am I?

Question:

The dirtier I am, the whiter I get,
Leave a mark on me when you stand, I'll leave a mark on you when you sit.

What am I?