hi dlight
it may be that you are depressed. one symptom is losing interest in things that used to bring you pleasure, thus your lack of interest in your chosen field as well as the suicidal feelings and failure in school. most schools have free counseling. check into when you go back or talk to your parents about it if you can and see if they can set you up with a good therapist. welcome to psych central. you will find we have several forums where you can post about your concerns and receive feedback from other members. you will get a lot of support here. again, welcome