The 26-year-old second-rower was sent from the Blues' Super 14 squad for their semi-final against the Sharks this weekend after continued breaches of discipline.
Williams confirmed the last of these was a drinking session before the final round-robin game against the Western Force last week.
He told a press conference: "Obviously I have got a few rough edges that I need to sort out as things like this have arisen and for me it is about trying to be a better person and in turn become a better rugby player.
"I don't intend things like this to happen but I think it is just my personality.
"I think it is one of those things I forever have to keep working on and developing but the issues I still have to sort out.
"But I have to take responsibility for my own actions. It takes two to tango but obviously I have put myself in this position."
"I have a lot to give back to this game and to this country and I want to start by doing it this year."
Williams' contract with Auckland and the New Zealand Rugby Union ends this week, but he refused to confirm if he would join the growing band of All Blacks leaving the country after the World Cup.