Science is the study of the material world; what is objectively observable, measurable and testable. The mind is none of these things.
You make the fatal error of assuming that psychology is science. It is not. If anything, it is a religion.
You make the fatal error of ignorance. Minds and their workings CAN be at least crudely charted.
Sure, psychologists have gotten cult followings but that happens when and because they are abusing their role as scientists.