Have a Trading Plan
Keep your emotions out of your investing. How? Develop a Trading Plan. Follow your trading plan. If you do not have a Trading Plan then your trading plan is to use your emotions. Professional Traders have and follow their Trading Plan.
Should Trading Plans be updated? Yes! Over time the Trading Plan that worked in this market may not work in that market.
Investors/Traders who have a Trading Plan tend to outperform those who do not. Which are you?
Should I keep track of every trade I make? Yes! You should know what stock you buy, why you bought it, and when are you going to sell it. And this should be included in your Trading Plan.