I can't keep going like this

I've been depressed since forever, and in serious burnout since three years. I go to class 37 hours a week and then I have homeworks, and it may not seem like a lot but I am so damn tired... I never was able to take a break because I am forced to go every single day. My parents refuse to let me take a break unless I am officialy given the right by a therapist to modify my timetable (it's a legal thing). But they forgot to take my appointement and now I have to wait for so long... I won't get any help before the end of the year, and at this rate I don't know if I'll reach it. I don't know what to do.