Almost every line here begins with "If only," and the repetition makes the poem feel like a spiral of regret the speaker can't escape. The wishes range from tender to awkward: remembering small details of what someone said, getting a proper goodbye, standing up to bullies, not embarrassing themselves in front of a crush. Underneath them all is one wish that appears on its own line: "If only I could be me."
The speaker seems to feel safe and genuinely themselves with one person, but exposed and judged everywhere else. The loss of that person, suggested by the missing goodbye and the fading memories, adds a quiet grief. The title's image of throwing away supermarket flowers hints at pain or anger, though the poem never explains it.
The mood is raw, vulnerable and unfinished. The last two lines, just "If only" with nothing after, trail off as if the speaker has run out of words, or can't bear to finish the thought.