I must be one of those narcissists who only appreciate things when they're gone. I'm too sensitive. I need to be slightly numb in order to regain the enthusiasms I once had as a child

from Kurt Cobain – Kurt Cobain's Suicide Note on Rap Genius

Meaning

Kurt needs to feel like shit before he can realize what really makes him happy. A narcissist is someone who is overly self-obsessed.

(conspiracy time) There are some people that believe that this note was just intended to be a note announcing that he was leaving the music business and Courtney, but someone else killed Kurt Cobain. Some of their arguments are that Kurt states here that he never makes mention of killing himself. If he killed himself he wouldn’t be able to appreciate what he lost, so that makes sense here. But there are a lot of other signs that point towards this being a suicide note, so don’t read to much into it.

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