Demi Lovato on her fights with Miley Cyrus

Demi Lovato says that while she often butts heads with fellow teen pop star Miley Cyrus, she and "Wizards of Waverly Place" star Selena Gomez get along like two peas in a pod.

"[Miley and I] are very strong-headed, so when we fight, its brutal," Lovato says in the most recent issue of Seventeen magazine. "Were like, Were never going to be friends again! Then two days later, were like, I love you and I miss you!"

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However, Lovato doesn't have issues with Gomez, who is currently dating Justin Bieber.

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Demi Lovato says it is easy to get along with Selena Gomez.

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But Lovato says that it isn't as easy to get along with Miley Cyrus.

"Selena and I, we never fight," says Lovato. "Shes not a confrontational person at all."

Regardless, Lovato says all three Disney stars are friends for life.

"Both of them will never leave my life no matter what happens, because weve been through so much together," she says.

For Lovato, "so much" includes hospitalization for bulimia, bipolar disorder and other "emotional issues."

"Im not gonna lie," Lovato tells Seventeen. "I was self-medicating. I was doing things like drinking and using [drugs], like a lot of teens do to numb their pain ... [Now] I don't drink, I don't do drugs, I don't throw up after my meals, I don't starve myself. There's nothing that I do that I feel ashame! d of."