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The singer, now 25, was just 13 years old when one of his YouTube videos was spotted by talent manager Scooter Braun - before he knew it, he was one of the biggest pop stars in the world, with an army of screaming teenage fans.
But it wasn't all plain sailing for Bieber, who had brushes with the law and hit headlines for the wrong reasons.
Now, in a lengthy post on Instagram, he has written about the struggles he faced and how his recent marriage to Hailey Baldwin has helped him get his life back on track.
He wrote: "It's hard to get out of bed in the morning with the right attitude when you are overwhelmed with your life, your past, job, responsibilities, emotions, your family, finances, your relationships.
"When it feels like there's trouble after trouble after trouble. You start foreseeing the day through lenses of 'dread' and anticipate another bad day."
He then went on to talk about a 'cycle of disappointment' and how 'sometimes it can even get to the point where you don't even want to live anymore'.
He added he was 'fortunate to have people in life that encourage me to keep going'.
Writing about finding fame, he said: "As my talent progressed and I became ultra successful, it happened within a strand of two years. My whole world flipped on its head. I went from a 13-year-old boy from a small town to being praised left and right by the world, with millions saying [how] much they loved me and how great I was."
Bieber says his young age meant he wasn't particularly humble about his achievements and all the praise went to his head.
By the time he turned 20, Bieber says he had 'made every bad decision you could have thought of', adding that he 'went from one of the most loved and adored people in the world, to the most ridiculed, judged and hated person in the world'.
He continued: "I started doing pretty heavy drugs at 19 and abused all of my relationships. I became resentful, disrespectful to women, and angry.
"I became distant to everyone who loved me, and I was hiding behind, a shell of a person that I had become. I felt like I could never turn it around.
"It's taken me years to bounce back from all these terrible decisions, fix broken relationships, and change relationship habits. Luckily god blessed me with extraordinary people who love me for me."
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