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As long as it's not the Equity card that makes you an actor, and as long as it's not the public accolades that you crave, just do it. You may never get the acclaim you deserve, but doing it for your own satisfaction - local playhouse, children's theater, whatever - may turn out to be more than you ever dreamed. It may give you a kind of satisfaction that burnishes the rest of your life, and open doors that you've had shut tight for a long time.
I've written all my life, and I have two novels - damn good, I might add - that will probably never be published. What they've given me is not easily measured, but the certainty that I am a writer has carried me into a lot of senendipities.
Don't give up. Just do it.