There's just something about it. I have no doubt that the OP had a love for saving obscure media and was searching for a song, but I feel like the "I'm dying" part was bullshit. There were commenters who had the same suspicion and they explained it better than I can.
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There's also this unverified user named Anne Boonchuy who was commenting and replying to people saying it was fake.
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Also, when the OP sang the part of the song she remembered, I just envisioned a sixteen-year-old munchie who was proud of her voice, which is completely biased and baseless of me, but it added to the inauthenticity. Maybe she lied so that it'd go viral and she would find her song. Either way, it didn't feel right.