Lyric discussion by Apple Dumpling 

I agree with the locking-himself-in-a-room-and-trying-to-write theory, but I think that when he says "note to self: no one cares, your voice is average" he's comming to the realization that no one really cares about his personal problems because everyone feels the same things. We all suffer lonliness and other common feelings, so his experiences are nothing unique.

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