If all the economics you know of is Macroeconomics, I understand your question. It is an extremely difficult field to study, and we may never really understand it.

But that's a small part of Economics, and the field in general is as hard as any science outside of physics, and had given us an enormous amount of insights we lacked 200 years ago, and contributed immensely to the relative peace and prosperity the world enjoys today.

as much as psychology and history are sciences, depends who you ask.

They are humanities, not sciences.