The speaker starts with a question many people quietly ask themselves: do my scars make me who I am? Scars show pain more clearly than words can, so it's tempting to say yes. Anyone looking at them would learn a lot without being told anything. But the speaker isn't satisfied with that answer, and the next question goes wider: what actually makes someone human?
The ending is the surprise. Rather than finding a neat answer, the speaker decides to stay "undefined." A definition, they realize, would shrink a whole life into a single dictionary entry, one word with a fixed meaning. Being labeled, even accurately, means being reduced.
The mood is thoughtful and a little vulnerable, but also quietly defiant. The short, plain lines feel like someone thinking aloud, and the final image of becoming "another word in the dictionary" lands with a calm, firm refusal to be boxed in.