Are you Comparing yourself with others unknowingly.!!!! The Anxiety could be due to fear or higher benchmark which you set. All these can be handled by understanding your strengths and weaknesses in a counseling session.

Hi. Although you have not provided much details about your problems, one thing that can be definitely said is that you should consider seeking a psychiatric consultation. Depression, anxiety, inability to concentrate are all symptoms suggestive of underlying psychological problem. Depending on other symptoms, treatment with medications or psychotherapy can be planned.