I think it's all because of fear! Fear is not only in trading, but according to all the criteria of life, to which he relates, he simply destroys everything. You need to learn how to control your fear first, then everything else itself will come.
You are right, fear really is the very first enemy of man. Because of fear, you can lose everything. The main thing is not afraid to lose everything, here is the most important rule of trade in crypto-currencies.