Hi, you are experiencing stress in some aspect of your life and reacting to this with these negative thoughts or unnecessary doubts that you are doing something wrong . I would suggest you to see a Psychiatrist for a proper evaluation of your problem. You will benefit from simple lifestyle changes and some counseling. You can learn to deal with these thoughts and behaviour patterns through counseling. In case you are overwhelmed by some stress , make simple changes and see a difference in yourself. Exercise regularly, eat healthy nutritious food, sleep adequately. Also try to practice Yoga or some breathing techniques to calm yourself . Focus on your strengths and stop comparing yourself with your peers. Keep off alcohol, stimulants or substance use. In case you are overwhelmed with studies or expectations of parents or your own expectations of yourself, you can go in for counseling. You can definitely feel better if you seek professional help in person. Hope this helps, All the Best!