I'm trying to be better, says Justin Bieber over marijuana pic controversy

The ‘Beauty and the Beat' hitmaker took over to the micro-blogging site claiming that he loves his fans and will never let them down.u00a0'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," Us magazine quoted Bieber as tweeting.

The 18-year-old singer did not openly address the Marijuana-smoking pictures, but indirectly wrote about facing new challenges and new doubters.u00a0'I'm ready. We are ready. See u all tomorrow and everyday after that," the singer tweeted.u00a0'Back on tour tomorrow. Ready to see u all smile. Time to do what I'm supposed to be doing. Performing," he added.u00a0