Spoken by someone who was used and then dropped, the poem is about being treated as a flaw instead of a person. The speaker begins by admitting she isn't perfect, but she pushes back: nobody is, and she was never anyone's object or possession. She then widens the lens, suggesting that the world makes people feel they should hide or shrink what makes them different, as if being unique were a wrongdoing.
The second half turns personal. Addressing a "you," the speaker says she was treated as a sin, ignored, and disliked for her personality. She calls herself a toy that was thrown aside once a replacement came along. The last lines are the most painful: she admits, reluctantly, that the other person "won."
The mood is raw and quietly bitter, mixed with sadness. The short lines and simple rhymes make it sound like someone speaking plainly, still stung by the rejection but holding on to some dignity.