Answer:
The more of me there is the less you see.
What gets sharper the more you use it?
I am the same written forward backward and upside down.
I ask no questions but receive a lot of answers
My head and tail both equal are my middle slender as a bee. Whether I stand on head or heel Is quite the same to you or me. But if my head should be cut off the matter's true though passing strange directly I to nothing change.
No matter how little or how much you use me, you change me every month.