The `Boyfriend` singer - who was the subject of pictures posted online last week which were claimed to show him smoking marijuana - finds it "reassuring" that he has the ability to "shock" his mother Pattie Mallette and father Jeremy Bieber, but has no intention of doing anything they wouldn`t approve of. The 18-year-old star told Top of the Pops magazine: "I still obey my parents, but I don`t have to. I could shock them too.
"If I really wanted to do something that I know they wouldn`t agree with, then I could do that now. Somehow that`s reassuring."
However, the star said his loved ones need not worry, because he`s not about to rush into any rash decisions anytime soon, as he potentially may have done when he was a little younger.
He added: "I`ve become more mature and a lot more grown up. Normally I make good, sound decisions. You don`t have to worry about me. My parents trust me."
Though Justin hasn`t commented on the marijuana claims, he tweeted on 05.01.13 that he wants to be a better person.
He wrote: "Everyday growing and learning. Trying to be better. U get knocked down, u get up. I see all of u. I hear all of u. I never want to let any of you down. I love u.
"I`m ready. We are ready. See u all tomorrow and everyday after that. Back on tour tomorrow. Ready to see u all smile. Time to do what I`m supposed to be doing. Performing (sic)."