Reflection is the 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 ??
Living I do not exist. Dead I am an inspiration. You always doubt me. But never reject me. I am what is given from old to young. Without me people would not learn mistakes. What am I?
I am a place when far away you want to return. Although, be here too long and you'll have to get out. You'd just hate for me to burn. But I will get very messy without a doubt.