Robbie Williams has revealed he experiences negative thoughts about his Netflix documentary.

The singer, 48, has editorial control over the content, which is being filmed inside his £17.5 million mansion in west London. 

He previously promised his Netflix documentary will be packed with sex, drugs and mental illness, insisting there’s no limits when it comes to filming.

Robbie has now admitted he fears the four-part show, which was announced last year, will flop.

He told The Sun: ‘We haven’t started shooting yet, but it’s supposed to be four episodes – four hours of airtime.

‘Negative thoughts are always on my mind’: Robbie Williams has revealed he experiences negative thoughts about his biopic Better Man

‘When it was first discussed, I thought, ‘I don’t deserve this’ and second, ‘It’s going to be s**t’. That’s how I think.

‘When I think about the documentary, I wonder how they plan to fill four hours. That’s not going to work.’

Robbie added: ‘Negative thoughts are always on my mind. I really hope that in the end I will think again that I was completely wrong.’

The multi-part series will launch in 2023 and will include never before seen footage as well as unfiltered access to the former Take That star.

The project is being produced by the creators of the acclaimed 2015 Amy Winehouse documentary film, Amy.

The official synopsis reads: ‘The multi-part series which will launch in 2023 will be an unfiltered, in-depth examination of a global icon and natural-born-entertainer who had to navigate the highs and lows of being in the limelight for more than 30 years’.

‘It will cover Robbie navigating media scrutiny throughout his career, adulation and addiction, professional and personal break-ups, reunions, recovery, and the impact they have had on his mental health’.

‘Featuring 25 years’ worth of intimate, never-before-seen archive, and exclusive access to Robbie; this definitive series is a no-holds-barred look at the entertainer and will reveal a more nuanced and multifaceted character’. 

Fear: The singer, 48, has now admitted he fears the four-part show, which was announced last year, will flop

Sad: Robbie previously revealed he went into rehab in 2007 after taking speed, acid, heroin, cocaine and ‘heart-stopping’ amounts of prescription drugs (pictured in 1996)

It comes after Robbie revealed that he will play himself in his biopic .

The team behind the Michael Gracey-directed flick, reportedly previously had trouble finding the perfect person to play Robbie in his younger days but an older Robbie has been found in the form of the man himself.

According to T he Sun, Robbie told the crowd at the Rob Laver Arena in Melbourne at a gig to celebrate the filming of the biopic: ‘The thing is about films is that it is a wonder anything gets made.

‘Everything gets held up in a bottleneck. It is always, “This person says no and this person says yes and this person is offended and this person is not offended enough.” It is agents and lawyers.

Robbie told the audience: ‘There are sex scenes that I do not condone. I am like, ‘If they must be in there, Michael, then you put them in there.

‘He said that it is a necessity for the script that I get completely naked and I am not sure why as there is one scene where we are in a church and it does not call for it.

‘It is my life and it is what I got up to. It is not anodyne, it is not vanilla. It is drugs, the ups, the downs, the women, the sex.’

The project will follow the singer on his rise to the fame and the demons he battled both on and off the stage.

Sources say Hollywood is excited about the movie following the success of other singer’s lives captured on film such as Elton John’s Rocketman and Queen’s Bohemian Rhapsody.

Insiders believe it could help Robbie crack America, after struggling to make it big across the pond – despite success in Europe when he first went solo after leaving Take That.

A source previously told the Mirror : ‘Early indications are that it may really cut through to US audiences, not least as the people in place on it have such pedigree.

‘Movie chiefs think the script – essentially a stirring story about an underdog catapulted to fame – will really resonate with people, even those in America who may not know much about Robbie himself.’

Directed and co-written by Victorian filmmaker Michael, the film will offer an introspective look into the experiences that shaped the English entertainer, both on and off stage.

Boy band: Robbie was a member of pop group Take That (pictured together in 1992) from 1990 -1995

Honest: But former Take That singer Robbie, who has been open about his years of addictions to drink, drugs and food, does not think he will allow his four children to appear

Robbie recently said on New Zealand radio station Newstalk ZB’s The Mike Hosking Breakfast show: ‘It’ll be full of sex and drugs and mental illness. 

‘They haven’t started. I’m sure it will be warts-and-all, and I’m sure it will be me giving away too much information about my life and times. 

‘I’m looking forward to getting it started and finding out what it is myself.’

Insisting there will be no restrictions, he continued: ‘No rules. I’m more likely than most people to leave everything in, I very rarely, if ever, have said, ‘That’s too much, take it off.’ I normally think that it’s not enough.’

Robbie added that even though he has ‘editorial control’ the makers are ‘very, very lucky because I want to expose myself more than anybody else exposes themselves’.

He said: ‘Most people want to do some sanitised version of themselves because they’re scared of giving too much of their real life away.

‘The audience can see that and I don’t respond very well as an audience member to that, so I won’t be doing that.’

But former Take That singer Robbie, who has been open about his years of addictions to drink, drugs and food, added he does not think he will allow the four children he shares with wife Ayda Field, 43, to feature in the show.

Family affair: Robbie is father to Teddy, nine, Charlton, seven, Coco, three, and two-year-old Beau with his wife Ayda Field, 43

The couple are parents to Teddy, nine, Charlton, seven, Coco, three, and two-year-old Beau.

He said: ‘I don’t think the kids will be involved. There will be me giving away too much information about the inner workings of my mind.’

Robbie was a member of pop group Take That from 1990-1995 before going on to great success as a solo artist selling 75.5million records.

He has also featured on television and hosted the Big Breakfast back in 1995, wrote the lyrics to the musical Boy in a Dress, as well as being an X Factor judge alongside wife Ayda Field, with whom he shares four children.