Sometimes it's going to be a good thing and sometimes it's going to cause us to lose so it depends on our luck. But being confident while trading is going to groom yourself as a better trader and you're going to do that trade with comfort in the long run, but when you're trading in fear you're going to always think about quitting the trading that won't make you a successful trader even if you're supposed to be.
You are right that we can never succeed if we trade in fear. It is possible to avoid loss if you start from here again without trusting yourself to gain profit in doing business. That is why we should look at the market situation and then invest.