Neymar is desperate to help Brazil – one of the favourites for the tournament – to their first World Cup title since 2002.
"What inspires me the most is playing football. Being inside the field is my greatest joy," he told Desimpedidos in a Facebook interview.
"The World Cup is the biggest championship in the world, I just want to play and be a champion. This cup has to be mine."
Tite's men have been drawn with Switzerland, Costa Rica and Serbia in Group E, with their first outing on June 17.
Having been sidelined since February, Neymar said he was slowly nearing a return.
"I've already started to train with the ball, I felt good, comfortable," he said.
Obrigado Deus... muito feliz de ter mais uma oportunidade de representar a minha nação!— Neymar Jr (@neymarjr) May 14, 2018
Partiu, Rússia !!!! pic.twitter.com/YNCStoMW7N
"Of course I had a little fear, but I'm slowly coming back."
Brazil and Neymar will also be looking to erase the taste of failure from the 2014 World Cup, when the side were throttled 7-1 by Germany in the semi-final on their home soil.