Lionel Messi turned 30 in June and says he is "very pleased" with life on and off the pitch.

"To tell you the truth, I never thought about how I'd be feeling when I got here [30]," he said.

"But I'm very happy with both my personal life and football. I'd say I'm in good shape on and off the pitch. I'm very pleased with where I am right now."

Messi says the 2014 World Cup final defeat to Germany is still an open wound.

"It's going to be there forever," he said. "I don't know if they're ever going to heal. We're just going to have to live with it. The World Cup is a very happy memory and a bitter one too because of how it ended, how it all worked out. But it's always going to be there."

Messi feels fortunate to have another opportunity in the World Cup.

"It was very important because missing out on the World Cup would have been a huge blow, firstly for the squad as a whole and then for me on a personal level," he said. "I don't know how I would have taken it. The same goes for the people of Argentina. Failing to make Russia would have been an all-time low for the country."