Indeed, economics end up being the study of resource allocations by human beings, both at the individual and collective levels, and the resulting system.

But macroeconomics is indeed based on a lot of things, and you seem to be very misinformed. Macroeconomics relies very heavily on mathematical tools such as calculus and topology to model the collective behavior of humans.

If you are really interested in learning more, I recommend "Knowledge and the Wealth of Nations: A Story of Economic Discovery".