Last Sunday, pop superstar Justin Bieber turned 21 and perhaps finally realizing that it's time for him to grow up.

In Justin Bieber's interview on Men's Heath April issue, he admitted that a part of him, indeed, never wanted to grow up. But upon years of creating wrong choices and adjustment to fame, the growing Justin has finally committed to leave his childish self far behind. He also talked about rumors of dating different girls at the same time and his playboy image.

On the April issue of Men's Health, which hits newsstands March 10, Justin Bieber shared, "It's time for me to grow up, this has been a big year for me, as far as figuring stuff out. This is almost like a full 180 from how I was. Yesterday - a year from yesterday - I was in jail."

At such a young age, Bieber has grown up through public eyes, which for him, had a trouble handling. During those year, "I had to grow up so quick, 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 conversations, but as far as actually growing up, there were a lot of things I missed out on."

"There's a part of me that I don't ever want to grow up, 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," he added.

When asked about being linked with different girls, and his infamous on-and-off relationship with Selena Gomez. Justin revealed that he was not at all proud of his "playboy" image. If it were up to him, he said he would take a serious relationship over dating any time.

"I'm very much a relationship guy, I like to bounce ideas off the person that I love. I like having a real connection."

The latest issue of Men's Health with Justin Bieber on the cover hits stands on March 3.