Lucina31's poem is about being sorted, labelled and squeezed into a role you never chose. The speaker is told where they belong, how to behave ("lady like"), and what they can't do, and the box image keeps returning: cardboard cages, locks, being "packed up" like an item on a shelf. The line "Gay straight must all be labelled" suggests the poem is especially concerned with how sexual identity gets filed away, though "Love is love" shows the speaker sees nothing wrong with who anyone loves.
The mood shifts as it goes. The opening feels powerless and a little weary, with the speaker "pulled along." Then frustration builds, and the ending turns defiant. The speaker refuses to lose their "voice within" and says they will set the boxes alight. The final rhyme of "alight" and "fight" gives that last stanza a punchy, determined feel, like a vow. Overall, it's an angry but hopeful poem about freedom to simply be yourself.