“Losing feels good,” Klitschko, 40, told. “I’m glad that my hand was not raised that night,” Wladimir told BBC Radio 5 live.
“Failure is not an option unless it is the only way to get better – and I had to get better. I needed a push to get better and I got it. I feel it.”
Klitschko, then the WBA, IBF and WBO champion, lost on a unanimous points decision in Dusseldorf, with Fury’s victory considered a huge upset.
“I didn’t show my full potential in the fight,” Klitschko said. “Physically, I was in one of my best shapes, but mentally I wasn’t there, not present in the ring.
“After a while, you get used to defending and not conquering the man in front of you. It will be different on 9 July. t’s not a rematch, it’s revenge.”
Klitschko, who has suffered four defeats in 68 bouts, had not lost for more than 11 years until he met Fury.
“If you want to destroy a person, give him five years of success. I had no failures for 11 and a half years,” said Klitschko.
“After a while it’s OK to make a mistake and I made a mistake against Fury. I want to make that clear in my revenge and it is what I’m looking forward to.”
Klitschko denied any suggestion he considered quitting after losing to Fury.
“I got over it,” he said. “I was suffering for three days after, then I shook it off.
“Any rumours of retiring were not true. Three days after the fight I called and executed the option of the contract. That was it.”