Punk is known for his outspoken views, which have often caused trouble backstage and got him in hot water with his bosses.
However, reflecting on a career that saw him start by wrestling in his garden as a teenager, the headliner said he wouldn’t change a thing.
Speaking to Fighting Spirit Magazine, Punk said: “For me the thing I’m most proud of — aside from being three-time heavyweight champion and winning Money In The Bank — is the fact that I started wrestling in my backyard when I was 15, and now I’m here.
“When a WWE PPV finished, I went to the backyard with my friends and we started trading blows with each other, just goofing off.
“I was CM Punk when I was rolling around with my friends in the backyard when I was 15, and now I’m CM Punk at WrestleMania XXVII fighting Randy Orton in front of 70,000 people.
“I’m also proud of getting there by doing things right by me, and by the business — even though those things nearly got me fired.”
Speaking of the well-received match with Orton, one of the highlights of an otherwise lacklustre Mania, Punk told of a sense of pride.
He added: “I hate everything I do when I watch stuff back, so I don’t tend to generally watch my matches again, but I did watch that one and I liked it.
“Obviously there were a few things I wish I had done a little different, but it will hold-up over time. For me, the highest praise was having the so-called ‘old timers’ tell me that they liked it.
“Bret Hart went out his way to call me up and tell me how much he liked it. Randy’s Dad (Bob Orton Jnr) loved it, as did Bob Armstrong. So much of wrestling’s history said it was good, and that it was the match of the night.
“Hell, they could be blowing smoke my ass, but I’ll take it anyway.”
Punk has emerged as one of WWE’s top bad guys over the last few years, first as head of the Straight Edge Society and now in charge of Nexus.
However, despite feuding with the likes of Orton, Jeff Hardy and John Cena, Punk has found himself cheered by the more hardcore fans who admire his dedication to the wrestling business — especially those on the company’s recent tour of the UK and Ireland.
“On tour I was getting cheered which made me want to pull my hair out,” Punk admitted. “I think it’s mainly from the older audience and it’s something that I think eventually happens to everyone when a level of respect is built-up.
“It’s just up to me to get them to hate me again by pushing their buttons.”