Here, a girl is stuck in the wrong place. She lives in the country, but everything inside her belongs somewhere else. The speaker repeats "city" three times, in her heart, her mind and her soul, so that it feels like every part of her has already left, even if her body hasn't. The surroundings and the person simply don't match.
The last two lines carry the sadness. She wants nothing more than to get away, yet the people around her "would never understand why." That suggests she feels alone, surrounded by people who know her but don't really see her. The speaker seems sympathetic, describing her longing plainly and without judgment.
The mood is quiet and restless. The short lines and simple wording make it sound like a confession, something a person might say softly about a friend, or about herself. It leaves us with a sense of yearning and of being misunderstood by the very people closest to her.