Ariana Grande On Her Late Grandpa and Falling Out of Touch With Her Dad

Ariana Grande covers Seventeen magazine's September issue, in which she opens up about her family -- specifically the importance of her late grandfather in her life -- as well as falling out of touch with her father and dealing with insecurities.

Grande's grandfather passed away from cancer on July, 22, 2014. He was 90 years old.

"My grandpa is sick, so I focus on him every day. I'm having the biggest song of my career so far, and all I can think about is my grandpa, because that's what's important to me," Ariana said in the interview, which sadly took place before her grandpa passed away. "He was like, 'You're a star, I know in my heart you're going to make this family so proud. You're a blessing.' And I was like, ‘oh my God,’ and started crying, and I trusted it."

"This interview took place before I lost my grandfather. Reading it back now is, of course, very hard but I'm so grateful that I spoke briefly about some of the wisdom he shared with me in this interview," she later followed up. "I hope the Seventeen readers find it helpful and can relate."

Video: Watch Frankie Grande Get the News His Grandpa Died

Though unfortunately, not all of Ariana's family relationships are as close.

She reveals to the magazine that she's currently out of touch with her father.

"It's private, but it happened last year. It took me so long to be okay with it," she admits. "The thing that got me there was embracing the fact that that I am made up of half my dad, and a lot of my traits come from him. So much of me comes from my father, and for so long, I didn't like that about myself. I had to accept that it’s okay not to get along with somebody and still love them."

The Problem singer, 21, also surprisingly calls out her fellow social media stars in the new interview -- Grande is one of the most popular stars on Twitter, with 16.9 million followers.

"Everybody makes up these ridiculous captions for their selfies that have nothing to do with the picture, like 'Layin' in bed on Saturday.' It’s like, No, you are not! You just spent an hour getting ready for this picture! We all post a selfie for the same reason -- because we feel better about ourselves than usual," she says. "So just be like, 'Hey, I feel good about myself today, so here’s a picture!'"

Though she does admit to having a lot of insecurity herself.

"It's tough to spend some of the most important years of your life in front of so many strangers who want to pick you apart. Insecurity has been the hardest thing I've had to overcome," she reveals. "I think everyone my age struggles with that because everyone strives for approval and wants to feel loved."

Video: Rumer Willis Spoofs Ariana Grande's 'Problem'

Seventeen's September issue hits newsstands August 5.