i know that Gregor has turned into some sort of bug but im confused about how he changd on the inside or what his realization was.
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Before his metamorphosis, Gregor is alienated from his job, his humanity, his family, and even his body, as we see from the fact that he barely notices his transformation. In fact, even his consideration for his family seems to be something alien to him, as he barely notices it when he loses this consideration at the end. After his metamorphosis, Gregor feels completely alienated from his room and environment and, as a symbol of this, can't even see his street out the window. The Metamorphosis, then, is a powerful indictment of the alienation brought on by the modern social order.
Alone in his room, Gregor tries to rebuild the self-identity that he had lost by living entirely for others and ignoring his own needs. He cannot, however, escape from what he sees as his family duty, and continues to act only to serve his family by doing his best not to inconvenience them. Gregor's comments about his family's behavior are often tinged with resentment at the way they treat him, but he will not allow himself to recognize his bitterness. Gregor manages to escape his self-effacing sense of duty only in the last chapter, when he asserts himself in realizing that his family has been neglecting him. Gregor's search for his identity seems hopeless, however, because he never had an identity to start with. He finds his humanity only at the end, when his sister's playing reminds him of his love for his family. This love, coupled with his freedom, is the final ingredient he needs to establish his identity.