Kewell said: "I've definitely under-achieved yeah. I haven't done anything with my career really and I've achieved nothing and I've done nothing.
"There are so many things I want to win, so many trophies. I feel confident I can do it because if you're not confident then why are you out there on the pitch?
"That was the point of coming to Liverpool. I've come to a great club to hopefully win things, to be able to put things right."