Do you know what CBT is? Cognitive behavioral therapy focuses on the changes we can make with our behavior using our minds. Check out this article on how to complete a thought log - which can help you challenge biased thoughts.
"Remember, the goal of CBT is not to ‘think happy thoughts’ but is instead to think accurately. Our thinking can become biased, but it is within our power to change the way we think. Identifying thoughts is the first step in managing our minds. Once we can reliably catch our automatic thoughts we can examine them to see how accurate they are and how fair we are being with ourselves."
Link to article here: https://www.psychologytools.com/self-help/thought-records/