If you want to feel depressed about grad school, read Weber...

..."Hence academic life is a mad hazard. If the young scholar asks for my advice with regard to habilitation, the responsibility of encouraging him can hardly be borne... Do you in all conscience believe that you can stand seeing mediocrity after mediocrity, year after year, climb beyond you, without becoming embittered and without coming to grief? Naturally, one always receives the answer: 'Of course, I live only for my "calling."' Yet, I have found that only a few persons could endure this situation without coming to grief."

- Science as a Vocation (1918)