I got burned by this too. Problem, unfortunately, goes deeper than just not learning how to do math. You skip learning ability to structurally learn new things at a young age, because you simply "get" how things work. So by the time you hit the wall you not only not know how to do math correctly, but also have no idea how to structurally learn correct way and must do both at the same time. Here most people give up and say they are bad at math.