Demi Lovato is Seventeen‘s newest contributing editor and for her first assignment, she’s hoping to help teens who might be in the same situation she was once in.

Here’s what the 18-year-old starlet had to share:

On her message to teenage girls: “If you are going through that dark period, go to your family and closest friends. Don’t put yourself in danger. It’s very crucial that you get your feelings out – but don’t ever inflict harm on your own body because your body is so sacred. I wish I could tell every young girl with an eating disorder, or who has harmed herself in any way, that she’s worthy of life and that her life has meaning. You can overcome and get through anything.”

On temptations to go back to her old habits: “Yes, there have been times when I definitely have been tempted to get rid of my dinner. But I will deal with it for the rest of my life because it’s a life-long disease. I don’t think there’s going to be a day when I don’t think about food or my body, but I’m living with it, and I wish I could tell young girls to find their safe place and stay with it.”

On how she keeps herself in a safe place: “I don’t let anyone’s insecurities, emotions, or opinions bother me. I know that if I am happy, that’s all that matters to me. And it’s okay to be selfish like that sometimes, when it comes to your well-being. Do what makes you happy, and don’t care what others think.”

On how she defines her personality after leaving treatment: “I don’t really define it by anything. I live my life every day, and if I feel like wearing combat boots one day and shoes the next, I will. I allow myself a lot of freedom and I’m very peaceful now. I have come to realize that just making yourself happy is most important. Never be ashamed of what you feel. You have the right to feel any emotion that you want, and to do what makes you happy. That’s my life motto.”