David Tennant is a ''nervous wreck'' over the pressure of finding work since 'Doctor Who'.
The 41-year-old actor admits he is insecure about his own acting skills since handing over his role as the Time Lord to Matt Smith in 2010, and he insists he is his own biggest critic.
David said: ''I'm always looking for a new project. There's a kind of exhaustive adrenaline push, which is alarming and overwhelming, but very motivating. It's fear of failure: is this the one where they discover I don't deserve to be at the party?
''I wait for someone to say, 'You've had a good run. Now it's time to go.' I admire other actors' work and then see mine and it seems false and crass. As an actor you put yourself up for appraisal on a regular basis and ask for your insecurities to be tweaked. No wonder I'm a nervous wreck.''
David's latest project sees him star alongside Billie Piper and David Morrissey in five-part BBC One drama, 'True Love', directed by Bafta-winner Dominic Savage.
He plays loving father and husband Nick, whose life is turned upside down by the reappearance of his first love, and David says he was nervous about Dominic's directing technique at first.
He told Radio Times magazine: ''I was taken aback. It wasn't what I expected. We were given a storyline, but no dialogue, which I've never done before. It was made up on the sport, which was difficult. I should be paid as a writer.''
David - who has fourteen month old daughter Olive with wife Georgina Moffat and has adopted her 10-year-old son Tyson - is due to appear in upcoming BBC4 thriller 'The Spies of Warsaw' and film new ITV1 drama, 'Broadchurch'.
Copyright © bangshowbiz.com 2012.
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