For Demi Lovato, being in the spotlight has never been easy. At the age of 18, the former Disney star entered rehab to deal with a number of issues, including self-harm and an eating disorder, and since then, has been exceedingly open about her struggles, although being so open has its consequences.

Earlier this year, a number of Lovato's very private photos leaked online, including pictures of her with her boyfriend, Wilmer Valderrama, whom she has chosen not to speak about to the media, having insisted that "some things have to stay sacred." Upset at the lack of respect for her privacy, the 21-year-old went on a Twitter rant lambasting those who had chosen to leak her personal photos.

"Completely and utterly disgusted at the absolute lack of any privacy or respect whatsoever in this world today. None. So disappointed," Lovato tweeted back in July before deleting her rant. "Artists don't owe anyone ANYTHING. We choose to be open and honest in our music with others...Yet this is how we are thanked?"

During the recent book signing for her new collection of inspirational quotes, "Staying Strong: 365 Days a Year," however, Lovato revealed to E! News that reason she's decided to stay in the spotlight despite its drawbacks.

"It's been difficult," she admitted. "I'm not the type of person that loves the fame aspect of it. I would rather sacrifice my privacy to help people, not just with my music. Strictly from this point of view, from an inspirational point of view of sharing my story. I know that I have a purpose in the world."

Not only is she now an author of a self-help book, Lovato has plans on writing a memoir as part of her multiple-book deal with Macmillan Publishers.

"I'm battling with internal thoughts on how honest I should be," she said during a recent interview with Entertainment Weekly. "Yes, I've been very honest, but if people really knew how dark and deep my struggles got - not just with my eating disorder but with drugs and alcohol - they'd be really shocked. But I'll most likely end up saying everything. Maybe it'll help other people in the industry who are headed down the wrong path."

Click here to see a video interview of Demi Lovato discussing the price of fame.