One of the things that affect some traders is that they don't accept their loss and move on, some traders will want to make back all the money they have lost since they started trading, they carry this as their most and only priority, and that leads to them losing more money.
The reason why you will keep losing more money when you don't accept your losses and move on and stop trying to win back all the money you have lost is that, when you want to win all the money you have lost by all means you become aggressive in your trading and when you are aggressive the effective power of your knowledge will gradually decrease leading to you making mistakes in the course of your trading which will lead to lose, so if you keep trading with the same mindset of winning back all your losses you keep being aggressive and keep losing.
So to avoid more lose as a trader accept your losses and move on, keep an open mind and you will start gaining more than you are losing.
Life happens your loss should be used as a lesson and motivation to achieve success.
When you talk about learning how to accept your losses you should please note that trading is definitely not for one who does not fully know and understand what trading is all about one should not just jump into trading but should rather study the market cap learn how the market goes and understand how it goes before starting a trade as a trader to avoid blowing away your funds
Talking from experience I had this seeming passion and desire for trading so I thought it's about the zeal with the basic knowledge so I started trading not even with a demo account, after blowing away my funds then I had to go back to the basics and study exactly how it works
Yes I totally agree with you if you say you say learn how to accept your loss as a professional trader