Dear Welcome to HCM We understand your concerns I went through your details. I suggest you not to worry much. I sincerely think that your experienced depression is not clinical depression and was just disappointment. That is nothing and such things happens to everyone. You must ask some questions to yourself. Are you able to concentrate on interesting movies? Able to concentrate on games? If the answer is yes, then you have no problem on concentration,. The problem is low interest level. As the first level treatment, you should be serious about your future career. once you are serious about your future, studies shall become interesting, because there is no other way if you want to live a prosperous life. Masturbation has nothing to do studies, concentration and human health. Do not mix things and confuse yourself. If you require more of my help in this aspect, Please post a direct question to me in this website. Make sure that you include every minute details possible. I shall prescribe some psychotherapy techniques which should help you cure your condition further. Hope this answers your query. Available for further clarifications. Good luck.