Answer:
I have memories but none of my own whatever's on my inside is what is shown. If I'm ever different it's because you changed me I feel like a decoration here for you to arrange me.
I have cities without people forests without trees and oceans without water. What am I?
I have a head tail but no arms and legs.
A dragons tooth in a mortals hand I kill I maim I divide the land.
If you lose me, you may cause people around you to lose me too. What am I?
Give it food and it will live, give it water and it will die.