A Shirtless Justin Bieber Covers 'Men's Health,' Talks Growing Up Too Fast

Plus, why he never wants to lose his "purity."

Justin Bieber is showing off his buff physique yet again for the April 2015 cover of Men's Health, going shirtless and opening up about his year of reinvention.

After a flurry of bad press in recent years, including multiple arrests, that egging incident and a reported fist fight with Orlando Bloom, the 21-year-old singer has recently taken some very public steps to rehabilitate his image. After a much talked-about apology video on Facebook, he's also appeared multiple times on The Ellen DeGeneres Show, admitting that he's done a lot of things he's "not proud of."

"This has really been a big year for me, as far as figuring stuff out," Bieber tells Men's Health. “This is almost like a full 180 from how I was. Yesterday -- a year from yesterday -- I was in jail."

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PHOTOS: Justin Bieber's Biggest Celeb Beefs

In the candid new interview, the "Baby" singer also admits that he's paid a price growing up in the spotlight, becoming famous when he was just 13 years old.

"I had to grow up so quick," he shares. "And it was almost like I grew up for the public but I didn't necessarily grow up. There were things I had to do, as far as the way I had to make relationships, and conversation, but as far as actually growing up, there were a lot of things I missed out on."

Still, despite his admitted immaturity, he says he never wants to lose his "sense of purity."

"There’s a part of me that I don't ever want to grow up," he says. "I want to always remain...to have that sense of purity inside of me where I don't...I don't want to lose that sense of purity."

As for his famous romances, Bieber insists he's "very much a relationship guy" and prefers brunettes in jean shorts and tank top or spandex. But his love for relationships goes deeper than that.

"I like to bounce ideas off the person that I love," he explains. "I like having a real connection."

And watch out for his next tattoo. The already heavily tatted-up Bieber reveals what new ink he wants next, and its personal meaning to him.

"I want 'LL' tatted right here," he says, pointing to his chest. "When you're Low, Lift. Because we often want to keep our heads down. But we should lift our heads."

Bieber's Men's Health issue goes on sale March 10.

VIDEO: Justin Bieber Continues to Apologize for Bad Behavior: 'People Often Forget I'm Human'

Watch the video below to see Bieber address his "arrogant" behavior in an emotional video he posted on his Facebook in January.