Emotionally and mentally down

It‘s not that I tried it but my life is such a mess right now. I never felt this bad and even If I was sad in the past because of something I just forgot it. I am so exhausted and have lost all my motivation for life since a few months. I just lie in bed and cry every second. My problem is not even that bad and people will probably think that I am exaggerating and should just keep my head up, but it really kills me. What it is? I am emotionally and mentally down because of stress. I have had practice driving lessons for a few months now and yesterday was my eighth. Yesterday I collapsed after the driving lesson and told my parents for the first time how exhausted I am and don't want to do anything anymore. My driving instructor is mean and says things like "This won't work out with the driving test if you keep this up" and I lose my motivation with that. Sure, my mistakes are my own fault, but does he really always have to beat me up like that? I feel stressed out because I just want to be done and get rid of him. So many friends of mine have passed me and will be done with driving school soon. On top of that I have lost all my strength and sometimes I don't go to school because I think about my stress until I start crying and can't sleep. Unfortunately I can't change my driving instructor or the driving school because my father has already paid so much money for me. Tomorrow is my next driving lesson and as always I am so worried and I am afraid that I will make mistakes again... I always hope that the lesson is over as soon as possible. This morning I cried again very hard because I felt so bad and I did not go to school again. Yesterday and today was the first time that I thought „I liked to end it all“
I don‘t even think that my Problem is that severe and why I‘m so stressed but my stress doesnt go away