The poem reads like a quiet list of sad facts about a girl: she's an only child, she has no friends, her parents are never home, and she cares too much about boys who don't care back. The tone is casual, almost offhand, as if the speaker is rattling off a case file. Opening with "oh, she was just..." makes her troubles sound small, though the details clearly aren't.
The turn comes at the end. After all that loneliness and fear of getting hurt, the speaker says the worst part isn't any single thing on the list. It's that she "gave everything / and received nothing." The closing question, "isn't that the biggest tragedy of all?", pulls the reader in and asks for agreement.
The mood is wistful and tender, with an undercurrent of ache. The past tense, "she was," suggests distance, and it's unclear whether the speaker is describing someone else or a past version of themselves. Either way, the poem feels sympathetic rather than dramatic, more a sigh than a cry.