Lyric discussion by nylonstring 

I have always been able to relate to Fiona's words & these lyrics are no exception. My personal brain-fight results in insomnia.

Initially, I misheard the lyric as "I just wanna be everything", which I also related to & thought fit the song, but of course the actual lyric makes sense, too.

But anyway, I agree with qiuliadm's interpretation - couldn't have said it any better.

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