After many years of experience, I realized that losses are part of the proccess trading. Losses happen to the best traders. The best traders I know do not have a 100% win rate.
When I take a loss, I sit down in order to:
a) review the trade
b) learn from my loss
What do you do when you take a loss?
Mistakes are main to happen likewise loses.
Trading is a risky game, you will lose at anytime and you can also gain at any time ; no matter how careful and how cautious you are, you can never be perfect which is it is call a risky game.
A good trader do not panic when they lose, they only take a good look at the trade to learn new things, they will review their mistakes and take corrections from there. But again, good and experienced traders don’t lose anyhow, traders that lose anyhow are probably copy traders with no knowledge about trading and people that jump into trading without any experience.