The Take That singer expressed hope that his forthcoming ninth studio album - recently described as his best record yet - and an accompanying tour will allow him to achieve the goal.
Williams told The Mirror: "It's very important for me to feel like I am competing, more so than ever. I haven't wanted to go out there and be the best in the world since 2005.
"I am looking forward to going out on tour, doing promo and kicking arse. Someone has to be the best in the world right now and I want to aim for that, and if I don't make it I want to be somewhere near it. This year will be the best year of my life."
Williams said that he is also hoping to make improvements in his personal life and become a "better husband" to wife of 16 months Ayda Field.
"I want to be a better husband. I want to be a better guy and I want to be as happy as I can be," he said. "I also wanna get really fit next year... [and] look the best popstar I can look at that time."
Williams confirmed in October that his latest album would be released under a new deal with Universal.
> Robbie Williams plans "world domination" with new album
Watch Robbie Williams in the video for 'Bodies' below: