Robbie Williams has said he suffers from a ''lack of self-esteem and self-worth'' but admits his lack of confidence has contributed to his success. 

Speaking on the WW Wellness that Works podcast, the 45-year-old singer explained why he believes "the curse is a blessing".

''The curse is a blessing because this lack of self-esteem, lack of self worth. It's been real drive. You know, it's like I'm here because I don't like myself very much.

"You know, that's the truth about the inside working of my mind, it's like, I don't like myself a lot and I feel uncomfortable in my own skin. And because of that, it's propelled me to do this on stage and be the 'let me entertain you' guy.''

Robbie with his wife Ayda

During the candid talk, Williams also spoke about his lifelong battle with his weight.

''Well, there is this relentless weight battle and weight issue that I've had forever. But the most recent thing that triggered this whole thing was I relapsed on smoking," he said. So when I smoke, I'm half smoke, half man. I'm a man of extremes.

"And the wife said, 'You've got to give up smoking. January the 1st.' And in May, that sounded like a good deal. And also, I didn't want to do the death, the early death. So I was like, 'yeah, OK'. Then it got to November. And I was like, 'remember January the 1st?' And I just thought, hang on, maybe I can just view this differently.

''This whole process, not only could I give up smoking, but I could be fit and healthy and have a clean head and a clean vision of how I want my future. And I found that moment to be very, very powerful.''

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