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i liked the unusual subject of this poem itself, because as you say yourself, “Seems ridiculous when you think about it/a teenager can’t experience nostalgia”. i thought so too, but then as i read onward you managed to turn my expectations on its head and explain what really is teenage nostalgia quite elegantly. i also liked the way the first and third stanza ended with rhyming words, theoretically/perpetually and give a sort of abrupt sense of endings to the stanza which allows the writer to really put forth the end of their childhood which we can look back on.
i think this is pretty good so far, so no further details are necessary!
i enjoyed reading this piece! keep up the good work!