Our brains are amazing, but they can undermine or uplift depending on our outlook.
I have decades of ingrained bias, negative thoughts, 'experiences' which lead me to think X instead of Y.
Negativity is especially hurtful when we turn it on ourselves. I can recall something I said in the 5th grade which everyone laughed at. Why? Why do I keep these useless things in my mind?
Be aware of your thoughts and work to shift them to the good. Your whole world will change for the better.