you are right, money only has value if we decide to give it value. Economics as a "science" treats money as a natural phenomenon which it is not, although it is certainly related to the flow of energy. We have all kind of blockages in the flow of energy because a lot of the trust we should be putting in humanity has gotten tangled up in money. I never argue that we should try to get rid of money, only that we find ways to begin extracting the trust from money and putting it back into community and other human beings. But I think we'll find as our trust in money is transformed into trust in humans, we'll see less and less money as we will have less and less need for it.
You should read "Debt: The first 500 years" by David Graeber, it really puts money into perspective and dispels a lot of myths that we learn from our parents and in school.