Is money just paper?

Think about this before responding.......Why is money so important. One day human beings got together and said let's make currency. They chose different ways and now we have the dollar. Isn't it just a piece of paper? Who is to say that we couldn't make a blade of grass currency, a dog biscuit, a bottle cap, etc. Why can't human beings quit being so thick headed and greedy so they can start actually changing things. We don't need presidents, we don't need money. It's like we are little kids given an allowance for doing chores. It's just paper and leaders are humans just like us. Why don't we all come together and help each other. Work as a team instead of being selfish in our own little bubbles wanting to baby sit other human beings........Think about it...