When you over-generalise, you exaggerate the frequency of negative things in your life, like mistakes, disapproval and failures. You might think to yourself: I always make mistakes, or everyone thinks I’m stupid. Instead, be specific: What are the facts? What are my interpretations?
Problems are a normal part of life, and we usually feel better when we do something to resolve them rather than just dwell on them. If you can’t solve the problem, change the way you think about it. You can practice acceptance and move on with life in a positive way.