My reason is quite simple and lacking originality: I reject all forms of authority that are unjustified. Which brings me to your next question: "And why are you against psychoanalysis?" For the same reasons I reject mythology, astrology, God, etc.: it is unscientific. (I’m not talking about its possible effectiveness as a treatment for disorders, but about its pretence to truth.)
Why are you an anarchist? And why are you against psychoanalysis?