I became much happier when I realized I shouldn't depend solely on my career for my sense of self. So I developed other interests and surrounded myself with a small group of friends I could trust.
But so much of being an actor isn't so great - the auditioning, the rejection, the financial insecurity.
That said, I should also add that I learned a great deal from being allowed in these privileged circles and am grateful for the opportunity to have worked closely with some of the most powerful and successful people in the business including Steven Spielberg and Ted Turner.
Originality is, for me, the most important quality in a script.
Fear of failure has always been my best motivator.