Sarah's poem is a short, raw burst of self-doubt. It opens with a question, "do they even care?", and answers itself immediately: "no." The speaker doesn't stop there. She goes a step further and says she can't blame them, because she doesn't care about herself either. Her low opinion of herself becomes the reason she thinks others reject her.
The image at the center is her flaws "written all over the surface of my skin." She feels exposed, as if everyone can see what she dislikes about herself, and that this is why people turn and run. The lowercase, plain wording makes it sound like a private thought typed out in a bad moment.
The ending is the saddest part. She knows she should stop chasing these people, but the final line, "but i can't," matches the title and leaves her stuck. The mood is lonely, tired, and quietly painful.