Written as a letter to "year twelve," the speaker looks back on a year when childhood seemed to slip away. She lists moments one by one: her first period, new bras, a cruel crush, a kiss meant only to escape pain, and a time she hurt herself and later told her mother. Small, ordinary changes sit right beside painful ones, which shows how tangled growing up can feel.
The speaker sounds regretful, tired, and a little scared. Time is a highway with her "speeding" along it, and she feels her life losing value "too much ahead of time." Her friends are the one thing that keeps her grounded, the "only weight" holding her to the earth. The mood is heavy but honest. She isn't dramatic about the loss, only plain about it, and the last line, "It's not been my happiest farewell," leaves the goodbye bittersweet rather than neatly resolved.