The poem moves from distrust of other people to a painful look at the self. It opens with blunt, almost nursery-rhyme lines about John and Judy, as if human failure were something to shrug at. Then "Nobody can save me" breaks through, and the speaker's despair becomes personal.
From there the poem turns into a kind of self-portrait. The face has squares for eyes, a misplaced nose and sharp geometric shapes, which suggests someone who feels distorted or fragmented, or who sees themselves that way. The speaker also seems to accuse the "you" of being full of self-importance yet confused about who they are, so the portrait may be a mirror for more than one person.
The lemons are the key image. They are bitter, but the next line holds out hope that the days ahead could be sweet. The final plea to "unshackle these chains" leaves the mood tense and weary, with a small, stubborn wish for release.