Ben Stiller doesn't think he has a ''drive'' for acting any more.
The actor-and-director enjoyed making his latest film 'The Secret Life of Walter Mitty' - in which he plays the titular lead character - and he wonders if his passion behind the camera has taken over.
He said: ''I don't want to ever be dismissive of it. To be a really great actor takes as much commitment as anything. But I do wonder sometimes, for me, if I have as much drive for that these days as I do to direct, because that I don't even question. But then it's also about finding the projects, and it's much more of a commitment.
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