Answer:
In my life I must bare my bloodline I must share.
I am heavy forward, but backward I'm not. What am I?
I have a head tail but no arms and legs.
What is the word that even in plain sight remains hidden?
You see a boat filled with people. It has not sunk but when you look again you don't see a single person on the boat. Why?
Whoever made me don't want me. Whoever bought me don't need me. Whoever use me don't know me.