Answer:
I belong to you but others use me more often than you do
I am higher than the king. What am I ?
What comes once in a minute twice in a moment but never in a thousand years?
What goes through a door but never goes in and never comes out?
I have roots nobody sees. I am taller than trees. Up up I go but I never grow.
Though not a plant, has leaves. Though not a beast, has spine. Though many wouldn't need this thing, It's more valuable than wine.