Different concepts of self, maybe, learned from your childhood.

Perhaps you have a limited mindset: suppose you have a happy, productive day of work/effort, and at the end of the day you are tired; on the following day, do you need to rest and rejuvenate because you worked so hard the prior day, or do you work even harder because your efforts from the prior day give you momentum and confidence to keep going?

Another thing to consider is, where do you get your self validation? So, like, were you raised with an internal focus or an external focus? Do you give your best effort and attention working toward your own approval and satisfaction, or do you work toward the approval of others?

As a kid, was it instilled in you that you were inadequate, lacking, or behind your peers in some way? If so, I expect you will spend the rest of your life feeling that way. And when things happen that contradict that, like even when you donate great job on something, if that doesn’t match watch was instilled in you, you experience cognitive dissonance, and your brain literally stops you from counting your successess and strengths, because it’s uncomfortable to think of yourself as adequate and complete.