Cogito Ergo Sum
In the Bhagavad Gita, Krishna teaches Arjuna "You are what you believe in. You become that which you believe you can become." The narrative you tell yourself about yourself is what determines how you get through life.
“I think, therefore, I am”. Descartes was clearly thinking when he coined this phrase. But it's not just thinking that determines whether you're conscious and alive, rather the quality of those thoughts.
If you think you are smart, then you will embody the qualities of a smart person.
If you think you are lazy, then you will embody the qualities of a loafer.
If you think you are incapable of something, then you will embody the qualities of someone who doesn't even try.
If you constantly beat ourselves up, doubt our abilities, and focus on our flaws, we'll struggle to achieve our goals and find fulfillment.
But if you cultivate a mindset of self-acceptance, self-compassion, and self-confidence, you'll be able to overcome shortcomings and find meaning in your endeavors.
Final Thoughts
Your self-perception shapes your beliefs, which effects your actions, and ultimately your reality.
We cannot control whether a good or bad thought pops in our head. What we can control, however, is turning them around as areas to improve on. It only take 1 line to turn - into +.