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Psychology relies on the same rigorous and critical scientific approach all the other fields follow, forming testable hypothesis and performing repeatable experiments.
Psychology is a study; scientific study yes because you study it using scientific principles. Making bread is called baking but you can also harden clay via baking however you won't find clay in a baking cook book. Same methods, different things.
Medicine is an application of science, much like engineering.
Psychology ultimately does more harm than good regarding the interaction of humans as a social species. Philosophy is sufficient for understanding the mind. Medicine and treatment of preventable neurological disorders are science. The human brain is more complex than can be understood by observation
Consciousness and observation are a subset of the mind, and knowledge can only be obtained via closing the gap between conscious and subconscious. Also, the healing process of a patient is decided by the environment; a doctor can only provide or remove aspects of that environment to allow healing.
The goals of psychology differ from typical science subjects (physics, biology, etc.). In these "hard" sciences, one is able to prove something that can be considered a fact. (e.g., Newton's Law). The goal of psychology is to show evidence, not proof- due to individual differences.