United Kingdom, March 23 -- Justin Bieber wants to tackle his "anger issues".

The 31-year-old singer - who has been the subject of months of speculation about his physical and mental health - has shared a series of candid Instagram posts over the last few weeks, and he's now shared his desire to "grow" as a person and to "react" less.

He shared three photos, including a hoodie-wearing selfie, a throwback image of his younger self, and one which appeared to be his seven-month-old son Jack Blues - who he has with wife Hailey Bieber - lying on a blanket watching a movie on a projector - and wrote in the caption: "I got anger issues too, but I wanna grow and not react so much smh.(sic)"

A few hours later, the 'Peaches' hitmaker admitted he...