0419_demiDemi Lovato is leaving "Sonny with a Chance."

The young star, who returned to L.A. after completing treatment for "physical and emotional issues" in January, tells PEOPLE she won't be returning to the hit Disney show ... despite being the main star.

"I don't think going back to Sonny would be healthy for my recovery. Being in front of a camera would make me nervous," she says, adding that she's going to focus on her music.

"Sonny" will continue without Demi and is being tweaked to focus on the show within the show, "So Random."

Disney is giving their full support to Lovato, saying "She is a talented young woman and our hearts are with her as she continues to take action to improve her health and bounce back from adversity."

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