Hi and welcome to Psych Central. Could there be a reason that you have lost interest in all activities? Are you sleeping OK? Do you still hang out with your friends? Im just wondering if you could be depressed and that is why you have lost interest in everything. Maybe talking with a counselor could be helpful in narrowing down what is going on for you. Can you talk to your parents about getting help before you get too far behind? You will find lots of support here on PC. again, welcome.