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"I was scarcely hid when a young girl came running towards the spot where I was concealed, laughing, as if she ran from someone in sport. She continued her course along the precipitous sides of the river, when suddenly her foot slipped, and she fell into the rapid stream. I rushed from my hiding-place and with extreme labour, from the force of the current, saved her and dragged her to shore. She was senseless, and I endeavoured by every means in my power to restore animation, when I was suddenly interrupted by the approach of a rustic, who was probably the person from whom she had playfully fled. On seeing me, he darted towards me, and tearing the girl from my arms, hastened towards the deeper parts of the wood. I followed speedily, I hardly knew why; but when the man saw me draw near, he aimed a gun, which he carried, at my body and fired. I sank to the ground, and my injurer, with increased swiftness, escaped into the wood.
This was then the reward of my benevolence! I had saved a human being from destruction, and as a recompense I now writhed under the miserable pain of a wound which shattered the flesh and bone. The feelings of kindness and gentleness which I had entertained but a few moments before gave place to hellish rage and gnashing of teeth. Inflamed by pain, I vowed eternal hatred and vengeance to all mankind. But the agony of my wound overcame me; my pulses paused, and I fainted." (16.19-20)
The monster’s good deed is not rewarded because people assume he is evil from his appearance.
"Cursed, cursed creator! Why did I live? Why, in that instant, did I not extinguish the spark of existence which you had so wantonly bestowed? I know not; despair had not yet taken possession of me; my feelings were those of rage and revenge. I could with pleasure have destroyed the cottage and its inhabitants and have glutted myself with their shrieks and misery. (16.1).
Oops. It seems like the monster is getting mixed up: he starts out all mad at his creator, and he ends up by wanting to destroy the cottage and its inhabitants. (He manages to stick to burning down the cottage.) It looks like revenge can have collateral damage.
"I continued for the remainder of the day in my hovel in a state of utter and stupid despair. My protectors had departed and had broken the only link that held me to the world. For the first time the feelings of revenge and hatred filled my bosom, and I did not strive to control them, but allowing myself to be borne away by the stream, I bent my mind towards injury and death. (16.12)
You know that feeling when you stop trying to be a good person and just let yourself think nasty thoughts about the celebrity on the cover of US Weekly? That's how the monster feels here: he's just had it trying to be the better person.