Demi Lovato may only be 21 years old, but she's already experienced a lifetime of ups, downs, heartbreaks and addictions.
Having struggled with self-esteem issues and spent many months in rehab, the singer now tells Cosmopolitan that she wants to serve as an example to others who can relate to her plight.
"When I was younger, I needed someone in the spotlight to idolize, who stood for positivity and light and happiness, and wanted to change the world," she tells the publication.
"And because I didn't have that, I realized, I want to do that, if only for my 12-year-old little sister."

1. Demi Lovato Cosmopolitan Photo
Demi Lovato covers this issue of Cosmopolitan. She was having a blonde hair day at the time of the shoot.
2. Demi Lovato for Cosmopolitan
Demi Lovato has an arm full of tattoos. She shows them off here for Cosmopolitan.
3. Demi Lovato Cosmopolitan Pic
Demi Lovato strikes a sultry pose here for Cosmopolitan. She is featured in the May 2014 issue.
Lovato is walking the walk as well.
She tells fans on Twitter to rise above bullying; she posts no makeup photos meant to help other young woman embrace their natural selves; she celebrates two years of sobriety.
"I always imagined my 21st being a huge party where I'd get shit-faced and go crazy," Lovato says. "But I realized that there's so much more to life than that."
Such as?
"Imagine walking 10 miles a day just to get water for your family? We have so much to be grateful for."
Amen, Demi. Amen.
In order to help others like her, Lovato has been open about her bipolar disorder, another topic she addresses with the magazine.
"It's a daily thing. I treat it with medication. Not everybody does that, but for me it works. That's what works for me – medicating, checking in with people, being honest, and being grateful for things."
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