Answer:
I am shared by goats devils and unicorns.
Little Nancy Etticote in a white petticoat. With a red nose; the longer she stands the shorter she grows.
I am perfect with a head perfect without a head; Perfect with a tail perfect without a tail; Perfect with either neither or both.
Born of sorrow, grow with age, you need a lot of me to be a sage. What am I?
I make you weak at the worst of all times. I keep you safe I keep you fine. I make your hands sweat and your heart grow cold. I visit the weak but seldom the bold.
Whoever made me don't want me. Whoever bought me don't need me. Whoever use me don't know me.