He added: “You don’t realise the power of just saying, ‘Hey, this is how I’m feeling.’
“I just kind of let the insecurities of everything going on dictate how I started to move.”
Scooter confessed: “If I could do it all over again I would have had you in therapy day one and have someone separate to all of us [his team] to talk to.
“There’s so many tragedies that could have been avoided.”
Bieber stressed the importance of vocalising any feelings of loneliness to help ease the strain people put on themselves.
“I just would encourage people, like, ‘Hey, if you’re feeling lonely, talk about it. Say it out loud.’
“There’s a freedom in that. I could have avoided a lot of pain.”
Bieber’s drinking and addiction to drugs spiralled as his fame intensified. In 2014, he was arrested for drunk driving and driving without a valid licence.
Bieber has been candid about his mental health battles in the past.
Last year, he said he’d “made every bad decision” by the time he was 20, after fame had “gone to his head.”
Justin wrote: “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.”
He also has Lyme disease – which he was diagnosed with after suffering with rashes, fever, headaches and exhaustion.
Justin and Hailey got engaged in July 2018 and wed in New York later that year, before tying the knot for a second in South Carolina last September.