There’s no way that you can live an adequate life without many mistakes. In fact, one trick in life is to get so you can handle mistakes. Failure to handle psychological denial is a common way for people to go broke.
The average result has to be the average result. By definition, everybody can’t beat the market. As I always say, the iron rule of life is that only 20% of the people can be in the top fifth. That’s just the way it is.