Because I'm stupid

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I first heard this song "Because I'm Stupid" while watching Boys over Flowers (a Korean drama). And I love it even if I don't understand the lyrics. I've been searching for the English translation of the song. I've found so many versions in youtube. But so far I'm not so sure of their translation and which is right. Two days ago I've decided to learn Korean language (hangguk-mal) because of this song. It's a long way for me learn more. Will you help me find the correct translation of this song? Your response will be much appreciated. Thanks