The Tunnel by Ernesto Sábato:
That night, like many other nights, I was alone as a consequence of my own failings, my own depravity. At such times the world seems despicable, even though I know that I am necessarily a part of it. Then a frenzy to obliterate everything sweeps over me; I let myself be seduced by the temptation of suicide; I get drunk; I look for prostitutes. I receive a certain satisfaction from proving my own baseness, in confirming that I am no better than the lowest of the low around me.