Hello Friend, Good that you are seeking a help here. I can understand your suitation. Concentration on studies is a quite common problem at your age and there are ways to handle it. As you are referring many other emotional disturbance within you including over weight , it's better to take a professional help to assess yourself first. This will help to analyze the root cause for your problems and suitable solutions. Don't hesitate to consult. Choose online consultation as it will be convenient and easy for your suitation.