It's OK, except there is a very high probability that you should have put "did" instead of "made".
2022년 2월 28일
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I would have said "I was procrastinating instead of studying math, and I made something cool."
I don't know why people are saying your sentence us grammatically ok, because I've never seen the word procrastinating used with another verb like that.
2022년 2월 28일
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It's grammatically ok, but the two halves of the sentence don't seem to have any relationship to each other.
2022년 2월 28일
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“I procrastinated studying my math, so I made something else cool instead”.