What Am I Riddles

Question: I am shorter when I stand and taller when I sit.
Sometimes I'm even called a pit.

What am I?

Question: I can hurt you unbearably and can't be touched. What am I?

Question: I'm the eyelid to your life and hide you when you're inside.
You can draw me and you can pull me, but you must leave to see my good side.

What am I?

Question: Different lights make me strange,
for each one my size will change.

What am I?

Question: Drop me and the world will shatter,
and you can always find me where you empty your bladder.

What am I?