Zac Efron admits he was going crazy at home before seeking help in rehab

The 26-year-old actor opened up about his troubles on the new NBC reality series, 'Running Wild with Bear Grylls,' and confessed he previously struggled to cope with fame.

Speaking about finding success at an early age, he said: "You know it was just so quick, it's shocking, you know what I mean.

"The challenging part was never the work, it was sort of the in between work, the social aspects outside of it."

He added: "You spend a lot of time in your house going crazy, you know pretty soon you need a social lubricant. Once I needed that, it became to go anywhere. It was getting to the point where I was caring less about the work and waiting more for the weekend, where I couldn't wait to go out and sort of let loose and have fun. But then when Monday and Tuesday were too difficult to get through, then I was like, 'Oh, this is bad.' "

Zac is trying to embrace a more relaxed lifestyle in a bid to stay sober.

He said: "I just really never again want to have to take anything from the outside in to me to feel good about my outside, [I want] to be comfortable in my present skin, and that takes a lot of work. It's just meditation and stopping, slowing down your brain."