The Ospreys flyer is targeting a third World Cup appearance having also been selected as third-choice scrum-half in 2003 and as a first-choice wing four years later.
Williams, who is the country’s top tryscorer with 51 in 73 games, insists everyone is Wales must now start looking forward rather than back at June’s series defeat in New Zealand, with next year’s global gathering the primary focus.
“There’s still a long time to go before the World Cup and you can’t get too far ahead of yourself. But that’s my goal – to get to the World Cup and be successful with Wales,” Williams told the Daily Post.
“We’ve got a massive 12 months ahead, especially with the World Cup coming up. I think we need to start concentrating on that and not worrying about what has happened.
“We’d have learnt a lot from the summer tour and the boys will have come back a lot better players.
“I watched the summer tour at home – both games – and felt the second was a much better performance. We competed very well with New Zealand and learned a lot from the first Test and made it hard for them.
“If it wasn’t for the try right at the end the score obviously would have been a lot closer, and probably a much fairer result.
“I’m always a big believer that Wales are good enough on their day to beat anyone and I honestly believe that.
“In the World Cup you always get some special performances as well, and some big giant killing acts too, and I do believe that Wales are good enough to win the World Cup.
“We’ll have to wait and see but New Zealand are easily favourites and are playing some of the best rugby I’ve seen since I’ve been playing. But we all know what happens to New Zealand sometimes in the World Cup, so it is just very much just on the day.
“I just hope we go into the World Cup full of confidence and go out there and just enjoy ourselves.
“Wales are very much like myself really, they play their best rugby when they’re enjoying it out there and I hope that’s what we take into the World Cup next year.”
Williams has suggested that the World Cup could be his last appearance for Wales, and even his last as a professional.
The 33-year-old is edging towards retirement at the end of the 2011 tournament after he stated that it would probably be time to make way for a younger generation of Welsh talent.
And although he has no plans to officially confirm his intentions just yet, he does admit that the current campaign could well be his last full season.
“I have to be realistic,” added Williams.
“My priority this year is to play well for the Ospreys, be successful with that, hopefully be selected for Wales and then go to the World Cup and to be able to say I’ve played in three World Cups and to say I’ve won the World Cup with Wales.
2After that, it’s possibly time for one of the youngsters to take the reins and go ahead and enjoy themselves.
“I don’t want to be one of these players that carries on playing just for the sake of playing. I know when I won’t be good enough to play for Wales anymore, the Ospreys as well for that matter as well, but we’ll have to wait and see.
“I’ve not put it in stone that after the World Cup that’s it, but by then there will be a lot of youngsters who are good as me, a lot younger than me and are far fresher than I am and (who will)  hopefully go on to have great careers.”
