Your complains seem to suggest depressive symptoms. Visit a clinical psychologist or psychiatrist for help.

Hello Friend, Good that you are seeking a help here. All your symptoms are sign of deep depression and anxiety. Holding on such emotional disturbance within you is not adviced. It will affect your mental and physical health. Better to ventilate your emotions and concerns to someone like a professional Psychologist, so that you can find a suitable solution to overcome. Don't hesitate to talk to a psychologists.

There could be various reasons for your lack interest in general... It is wise to seek a professional support. Consult a psychologist.