The poem is about a girl fighting the urge to self-harm while keeping it secret from the people around her. It is told in the third person, but it feels close and private, as if we are listening in on her thoughts. The repeated "cut cut cut" shows how an obsessive thought can take over her mind, and the short, plain lines make her struggle feel raw and unpolished.
What she feels most is isolation. She is physically surrounded by friends, yet she believes she cannot let them see how bad things are, because she thinks they would leave. The line "She knows so, because they said" suggests she has already heard them reject something like this, which makes her silence feel like self-protection. The mood is heavy and bleak, ending with the fear that her pain will grow until it kills her. It reads as a cry for someone to notice, and anyone who feels like this should talk to someone they trust.