Page 4: The creature finds Victor Frankenstein’s lab journal in the clothes he stole from the laboratory after he was created and ran away. After reading this journal, why is he so angry at Victor?

The Creature is angry because Victor created him only to abandon his creation.

"Another circumstance strengthened and confirmed these feelings. Soon after my arrival in the hovel I discovered some papers in the pocket of the dress which I had taken from your laboratory. At first I had neglected them, but now that I was able to decipher the characters in which they were written, I began to study them with diligence. It was your journal of the four months that preceded my creation. You minutely described in these papers every step you took in the progress of your work; this history was mingled with accounts of domestic occurrences. You doubtless recollect these papers. Here they are. Everything is related in them which bears reference to my accursed origin; the whole detail of that series of disgusting circumstances which produced it is set in view; the minutest description of my odious and loathsome person is given, in language which painted your own horrors and rendered mine indelible. I sickened as I read. 'Hateful day when I received life!' I exclaimed in agony. 'Accursed creator! Why did you form a monster so hideous that even YOU turned from me in disgust? God, in pity, made man beautiful and alluring, after his own image; but my form is a filthy type of yours, more horrid even from the very resemblance. Satan had his companions, fellow devils, to admire and encourage him, but I am solitary and abhorred.'