A person sits indoors, looking out a window at strangers walking past. That's the whole scene, but it carries a lot of feeling. The speaker watches ordinary people going about their day and envies them, thinking, "If only I could feel so free." The title, "Trapped," tells us how the speaker sees their own situation. The poem never says what holds them back, whether it's a physical limit, a mood, or something else, so we're left to imagine it.
The mood is quiet and wistful, with a small flicker of hope at the end. "Maybe I should try one day" is tentative: it isn't a promise, and "one day" keeps the change safely in the future. That hesitation feels honest. The speaker can see freedom clearly, yet still stands at the glass. The window works as both a view and a barrier, close enough to tempt them but still separating them from the world outside.