Answer:
I am in the past never in the future. I don't exist but have existed. I saw what you saw and that is what I will ever see.
I never sleep yet sometimes I weep. I can get angry or just be happy. Wherever you go, I will follow. No matter what you do, I will be there. I cannot die. What am I?
Why is leather armor best for sneaking?
If I drink, I die. If I eat, I am fine. What am I?
I direct you from outer space.
Whoever made me don't want me. Whoever bought me don't need me. Whoever use me don't know me.