The number one way to stop the wrong trading/selling decision through fear is to invest in a cryptocurrency that's as huge crypto community support, built on longevity, has a good market cap, and historical data.
Second, don't check the market chart frequently or habitually.
Third, crypto trading is like gambling and it is not meant for everybody because of buzz control. I will advise you to examine if trading is for you or investment (buy low and sell high).