There is a possibility that you might be suffering from mild depression. It might not be your laziness but lack of motivation which is barring you from having a normal life.

As doctorbee has mentioned already, try to eat healthy and find a way that can motivate you to hit the gym. Endorphins are the natural cure for your "laziness". I would also suggest you to stay away from alcohol for time being as it works as a depressant.

Good luck.