You are mistaken in your understanding because you probably read information written by other poor or middle class people, who are also poor. Most humans are afraid of losing money, like children who don't want to lose their favorite toys. This is why they don't invest and when they invest, they panic and make bad mistakes all the time.

A person who is good with money, does not fear losing it. They have no emotional attachment to money, but they always want more. They take more risks, better risks. They hold investments longer even through massive losses. They do not care. That is the right approach towards money. Remember the key different that I wrote, it is good to lose money only if you are earning even more money. Lose $1000 today, make $2000 tomorrow. If it was not for this difference, gamblers and other idiots who ruin their lives would think they are being smart with their money.