on my limit

I have to say -at the point of drinking while doing a final report- that I am in an extreme situation. I have to say -at the point of crying on the train just because I think I will not be able to hand a final report- that I am on my limit. I have to say that -unfortunately (or not)- I am not material for a super-high-excellence program like the postgraduate program of the University of Tokyo. I simply do not have the guts for working till death. I do not have the mental stability to hang on this. And now I understand the reason why schools do not accept emotionally unstable students. This is just too much pressure. And my weak personality is not enough for this. Now I see. I can clearly feel my limitations. And I am not sorry about this.