Answer:
I never was but always will be. No one ever saw me but everyone knows I exist. I give people the motivation to better themselves every day. What am I?
I don't live within a house, nor do I live without. Most will use me when they come in, and again when they go out. What am I?
As I went over London Bridge I met my sister Jenny; I broke her neck and drank her blood and left her standing empty.
If you've got me I'm everywhere. If you share me I'm nowhere. What am I?
I have a gown but I'm not a priest; I have a crown but I'm not a king.
Whoever made me don't want me. Whoever bought me don't need me. Whoever use me don't know me.