Answer:
If you have me, you want to share me. Once you share me, you won't have me. What am I?
I build bridges of silver and crowns of gold. What am I?
I carry you down a gentle stream.
Forward I am heavy backward I am not. What am I?
Little Nancy Etticote in a white petticoat. With a red nose; the longer she stands the shorter she grows.
No matter how little or how much you use me, you change me every month.