Help me decide what to do please

I'm in my second year of physiotherapy school and I cannot cope. I am feeling like a loser. I have my exams in a week and I have not started studying, I haven't even bought textbook for one subject because I have grown apathetic. I keep crying randomly for no reason, get thoughts of wanting to die and quit. I don't want to do physiotherapy and want to quit but feel like a loser that I can't even cope with stress. I am useless and have not many friends. Those I have I haven't been in contact with for a while because I can't do anything but lie on bed. My parents are worried but I don't know what to tell them. I really want to quit but I don't know what I'll do. I really really can't do this. But what will I do? I feel so alone.