People who understand how to trade often struggle to understand and dissect themselves. We all have different problems from our childhood or upbringing that bleed into everything we do. Trading, in particular, exposes these problems, especially psychological ones. If you're naturally impatient, trading will highlight that. If you get overly excited, fearful, or greedy, trading will expose those traits too. Many people are not willing to work on themselves, identify their problems, and create a structure to handle them.