Emotion is what makes trading difficult for most people.  Technical Analysis is all about analyzing the collective mass emotion/psychology that causes patterns to form on the charts. Unfortunately we as humans also fall prey to our own emotion. And again everyone is different, some people are MUCH better at dealing with it, while others are not.  It takes time, and having a systematic approach where you have a rules that you are following helps - because the emotions are most difficult when you don't have rules or a decision that is pre set.

I'm sure Spock from Star Trek would be a great trader since Vulcans suppress their emotions LOL  

or....maybe one of Elon Musks Optimum robots LOL

there's a book called 'The Trading Athlete ' it makes a strong case with a bunch of examples of why former professional sports players have made great traders - why? Because they had to learn to control their emotions in stressful situations in games and in the public, and that directly translates to trading

https://www.amazon.com/Trading-Athlete-Winning-Mental-Online/dp/0471418706