Come on mate, identifying your pain points and spending a few minutes in front of the mirror reminding yourself isn't going to wear you out for the rest of the day!
It is not a matter of effort, but of creating false expectations. If you use affirmations, you are creating a positive statement of something that doesn't exist. For example, to combat the idea of "I am a loser", you create an affirmative statement "I am a winner".
The problem, however, is that neither of these statements are true. You are not a loser neither a winner a priori. All you can do is to improve your chances of being successful, since you cannot really control the results.
