The speaker is talking directly to someone they care about, a person who seems to be weighed down by shame. The first stanza lists what this person is not: a clumsy moment on the stairs, anxious words, scars, and the harsh labels "evil," "broken," and "selfish." The second stanza answers with what they are, and it gets specific and warm. There is the way their feet move on the grass while dancing, a smile that brightens the speaker's day, a laugh everyone finds contagious, and arms held open to others. Then come the plain words "good," "whole," and "kind," which mirror the earlier negatives.
The mood is tender and reassuring, but the last two lines add a sharper edge. The speaker suggests that "the boy from the first stanza" might deserve to die, which seems to mean the self-hating version the person sees in themselves. The poem then turns: "you deserve to thrive." It reads like a plea to let that harsh self-image go.