Cause you've set me on fire
I’ve never felt so alive, yeah

from Guy Sebastian (Ft. Lupe Fiasco) – Battle Scars Lyrics on Rap Genius

Meaning

Guy Sebastian is comparing his emotional pain to physical, the seemingly excruciating pain of burning doesn’t feel as farfetched as he has been emotionally beaten.
Instead of the usual meaning of “feeling so alive” (a natural high) Guy Sebastian is expressing that the emotional wounds he is enduring only proves how mortal he truly is.

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