Demi Lovato is guest-editing and on the cover of the August 2014 issue of Seventeen magazine, which hits newsstands on July 1. Lovato talks about her life after rehab and gives advice about staying strong.

The "Neon Lights" singer entered rehab in late 2010, and has been an advocate for people dealing with mental health issues since then.

Lovato said about her life after rehab, "Since I went to treatment, there have been days when it's felt really easy, and I've felt great about where I am. But then I have moments when it's not. That's life. You can't just take your mind and your body into the shop and get it fixed. It doesn't come out repaired. It's not like a car. It takes time - pace yourself. Every day is a new opportunity to change your life and be who you want to be."

She added, "I tell myself five things that I'm grateful for, for every negative thing that I think," the singer explains. "You know how people have swear jars, where if you swear you have to put a dollar in the jar? You could do that with feeling insecure-every time a friend says something bad about [himself/herself], they have to put a dollar in a jar. [And then] you can donate it to charity."

The 'Neon Lights' singer also talked about her friendships, saying, "I like to have friends in my life who believe they're going places and are working toward their dreams. When you're growing and the people around you aren't, that's when you have to start shedding them. I've done that a lot over the past few years, but it has been so worth it, because the people in my life today inspire me to keep being creative, to have fun, and to be a good person."