Why do so many people lose money playing contracts???

1 Frequent opening of positions
2. An unstable mindset will change direction with just a slight fluctuation.
3 Holding on to losses stubbornly, not adjusting positions, and unable to hold onto profits.
4 Today open this, tomorrow open that. Not focused enough, can't grasp the market trends.
5 Can't make big money, and have no patience to earn a little. Look down on small money,
6 Want to make a lot of money, feel like I can hit it right once, go all-in, not leaving any opportunity for myself,