If you always feel incompetent, it is a manifestation of mental illness. It may be caused by your own inferiority complex. In this case, the most important thing you should do is to establish a kind of self-confidence and believe that you are the best. Then, you can improve yourself by exploring your hobbies. Your ability, such as some professional aspects, such as your specialty in playing ball or singing. Or some painting courses. Through continuous accumulation, you can tell your phenomenon and finally feel that you are the best. Come on!