Thursday 14th March 2013 by Grace Carroll | Photos by WENN

Tags: Justin Bieber

Justin Bieber has posted a lengthy rant against critics on his Twitter account after a troubled few months, denying he needs to enter rehab and hitting out at 'countless lies'.

It's been a rough few weeks for the 'Beauty and a Beat' singer - after being denied entry into a London club, he started wandering around shirtless and turned up on stage for a concert two hours late. The following night, he suffered breathing problems on stage and attacked a paparazzi - and that's just the start.

Now he has taken to Twitter in order to speak out about the negative press, despite being advised by his team to stay quiet - and later deleting the post. The rant, which was published on his Instagram account, made an odd comparison to Lindsay Lohan and bragged about achieving so much when only 19.

"Everyone in my team has been telling me, 'keep the press happy' but I'm tired of all the countless lies in the press right now," the rant began. "Saying I'm going to rehab and how my family is disappointed in me. My family is beyond proud, and nothing's been said by them, my grandparents wouldn't know how to reach to press even they did want to so that was a lie and rehab cmon.

"If anyone believes I need rehab thats their own stupidity lol. I'm 19 with 5 number one albums, 19 and I've seen the whole world. 19 and I've accomplished more than I could've ever dreamed of. I'm 19 and it must be scary to some people to think that this is just the beginning. I know my talent level and i know I got my head on straight. I know who I am and I know who I'm not. "My message is to believe."

Justin Bieber performing at London's O2 Arena

The post continued, "My albums could be about anything but my messages have been to never say never and believe, not to believe in me, but to believe in yourself... I honestly don't care if you don't believe in me because I believe in me, and look where that's gotten me so far. I'm writing this with a smile on my face and love in my heart.

"Letting u know first hand how I feel rather than have these story linger. I'm a good person with a big heart. And don't think I deserve all of this negative press. I've worked my a** off to get where I am and my hard work doesn't stop here. I'm growing up finding myself while having people watch me and criticise me everyday I think im doing pretty damn good. And to those comparing me to Lindsey Lohan look at her 2012 tax statements."

Photos: Justin Bieber hides fan shame with gas mask in London