"According to the National Science Foundation, an average person has about 12,000 to 60,000 thoughts per day. Of those, 80% are negative and 95% are repetitive thoughts. If we repeat those negative thoughts, we think negative way more than we think positive thoughts.
Cognitive Behavioral Therapists have a term for it — ANTs (Automatic Negative Thoughts).
All negative thoughts are not bad. Being alert can help you survive but most negative thoughts are useless. They only create imaginary drama in your mind. Let’s break this pattern." - This article from Medium and mission.org gives you the steps to break the cycle of negative self-talk.