literal translation would be

- 내가 부셔저 버렸어.(I have been broken into pieces)

something like these?

but like you said, if you wanna use it as a phrase for a song..

무너져버린 나 (- fallen me)

산산조각 나버린 나 (- shattered me)

난 산산조각이 나버렸어 (- I happen to be shattered)

something like these would sound ok and natural for song lyrics.

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