A speaker works up the nerve to confess a crush, and the poem reads like a rough draft of that confession, awkward bits left in. They start with a clumsy compliment: not "cute," not "ugly," but "pretty," or really just nice to look at. They admit they're bad at finding the words, and they imagine the day the person finally reads this. The addressee is named as Parker, which makes it feel personal and direct.
What the speaker wants is modest but heartfelt: kindness, and even if the feeling isn't returned, that the friendship doesn't end. The line about feeling like a kid again, when you're shorter and "everyone still listened," is funny and a little sad, hinting at wanting to be heard.
The last stanza falls apart as the speaker keeps tripping over things already said, then backs away from "I love you" entirely. The mood is sweet, shy, and a bit anxious, and the unfinished ending makes the fear feel real.