The poem is built on a simple mirror. The speaker describes another girl named Marie with four bright qualities: cuter, tougher, happier, smarter. Then the speaker says "My name is Marie" and lists the exact opposites: uglier, weaker, sadder, dumber. Same name, same sentence pattern, completely different worth, at least in the speaker's mind.
What stands out is the repetition of "than most." The speaker isn't just feeling bad in a vague way. They are measuring themselves against everyone else and coming up short. The shared name makes it sharper, because it suggests the other Marie is a kind of ideal version of who the speaker might have been, or who they feel they should be.
The mood is flat, bleak, and quietly painful. There's no explanation or plea, just a blunt list, which makes the self-criticism feel automatic, like a habit of thought the speaker can't switch off.