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.
Just as you said, your losses should be a lesson to you, use it as a stepping stone to learn more and make adjustments. Every mistake is a lesson, only a fool repeats a particular mistake, you can only make a different one. Trading has it's ups and downs but you must learn to accept every outcome. There are days you would lose, there are other days that you would hit just stop loss through out the day.