Demi Lovato. Picture: Instagram
Demi Lovato admits it will always be tough for her to stay sober after quitting alcohol and drugs in 2010.

The 25-year-old pop star went to rehab back in 2010 to seek treatment for a dependence on alcohol and drugs, and get therapy for an eating disorder and self-harming.

Demi has managed to stay clean ever since but she admits her recovery still requires her to be vigilant everyday and she shares the difficulties about her teetotal lifestyle in her new YouTube documentary series 'Simply Complicated'.

In an interview with Billboard.com discussing the YouTube series, she said: "I think what was difficult about the process was being honest about where I am in my life today. Telling the world that I'm not the poster child for recovery. Sometimes it is a struggle, and sometimes I still deal with issues that I have suffered from in the past. It's a challenge to maintain recovery, and I talk about that in the film. So, for me, it's like kind of admitting that I'm not . Obviously I'm not perfect, but admitting that on camera. I want to be the best role model that I can be for my fans, so by admitting that I'm not perfect, it's kind of weird for me."

Demi — who also lives with bipolar — has 50.3 million followers on Twitter and 61.5 million people checking out her photos on Instagram and she is proud to be a role model for all her fans.

The 'Sorry Not Sorry' hitmaker thinks what makes her a good role model is that she has had to deal with her own demons and has been honest about the difficulties she has endured in her life.

She said: "I think that's what makes me a role model for people is that I'm not perfect. It's that I'm honest about where I am, but I think for so long I've been such a strong advocate for the things I believe in, and certain things I still struggle with. I think explaining that on-camera was difficult for me, but it's needed. People need to hear that it's not a perfect journey and every day is easy; some days are challenging."