I think actors are divided into two groups: one that wants to be an actor to become famous and rich and the other that wants to be an actor because they have to be. I'm more in the second group.
I always thought it was strange when these artists like Kurt Cobain or whoever would get really famous and say 'I don't understand why this is happening to me.' There is a mathematical formula to why you got famous. It isn't some magical thing that just started happening.
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I think there are a lot more writers who are actors than you know they just don't have roles on famous TV shows that you recognize.