The poem opens in the first person, with a speaker staring into a mirror and feeling only disgust, then shifts to speak about "she" and address a "you." That change suggests a voice looking back at a girl, or perhaps at herself, and blaming the people who shaped her. The subject is an eating disorder, and the poem treats it less as a personal failing than as something society pushed her into. The repeated "they" and "you" stand for the voices that said what a body should look like.
The speaker feels anger, grief and regret. She wishes someone had told the girl that food is good and that hurting herself was wrong. Details like the thigh gap and the torn throat make the damage feel physical and close. By the end, the girl is dead, and the final lines call society "monsters who owned her." The mood is bleak and accusing, with a sense of loss that could have been avoided.