Answer:
I am in the past, never in the future. I don't exist, but have existed. I saw what you saw, and this is what I will ever see. What am I?
If you have me you want to share me. If you share me you don't have me. What am I?
I can generate fear and some say I come out of your ears. I am as quiet as a mouse but not welcomed in the house.
Santa shakes his belly like a bowl full of me
The higher I climb, the hotter I engage. I cannot escape my crystal cage. What am I?
It has no top or bottom, but it can hold flesh, bones, and blood all at the same time.