Hello Friend, Good that you are seeking a help here. Thinking too much about person or incidents or subjects or future etc are symptoms of Anxiety. Such overwhelming or pre occupied thoughts creates negativity, fear, insecurities in your day to day behavior in life. Be positive. You can overcome this a guidance of psychology expert to learn the trick of managing your thoughts and mindsets through suitable psychotherapies. Feel free to reach out to a psychologists directly or online. You can easily consult me online through Practo app for further assistance.

It seems you are facing anxiety issues, it needs to be evaluated before any treatment recommendations. Please consult a Clinical Psychologist or a Psychiatrist.