Answer:
I am an odd number. Take away a letter and I become even. What number am I?
I am always around you but often forgotten. I am pure and clean most of the time, but occasionally rotten. What am I?
I may only be given but never bought. Sinners seek me but saints do not. (one word).
I go around in circles but always straight ahead never complain no matter where I am led. What am I?
If a man carries my burden they will get crushed to death. Though not rich I leave silver in my track.
Whoever made me don't want me. Whoever bought me don't need me. Whoever use me don't know me.