The fact is, I can't fool you, any one of you. It simply isn't fair to you or me. The worst crime I can think of would be to rip people off by faking it and pretending as if I'm having 100% fun.

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

Meaning

Not only is he sick of having to portray a false image so he won’t disappoint anyone, he is sick of making his fans believe something that’s not true (that he’s having fun).

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