Answer:
Die without me, never thank me. Walk right through me, never feel me. What am I?
If I drink I die. If I eat I am fine. What am I?
I begin and have no end and I end all that begins. What am I?
I am gentle enough to soothe your skin, light enough to fly in the sky, strong enough to crack rocks. What am I?
I may be of the eye, in order I am pie. In my center there is a star, I keep medics where they are. What am I?
Whoever made me don't want me. Whoever bought me don't need me. Whoever use me don't know me.