Paris Hilton opens up about trauma: 'Something happened in my childhood that I've never talked about with anyone'

Paris Hilton's upcoming YouTube documentary will reveal a new side of the heiress and TV personality.

This is Paris, a YouTube Originals documentary, explores the life of the star, whose great-grandfather, Conrad Hilton, founded the well-known chain of Hilton Hotels.

In an exclusive sneak peek released by People, Hilton discusses the mental abuse that she went through as a teenager at boarding school.

"I'm nervous," she says. "I'm shaking. It's hard to even eat, because my stomach is just like, turning. I don't know — it's something that's very personal, and not something I like talking about.

"No one really knows who I am. Something happened in my childhood that I've never talked about with anyone. I still have nightmares about it."

The documentary description reads: "This Is Paris uncovers the hidden past of the international icon. As Paris confronts the heartbreaking trauma that forged who she is today, this deeply compelling portrait tells the real story of a teenage girl desperate to escape into a fantasy and sheds new light on the insta-fame culture that Paris helped to create."

READ MORE: Paris Hilton says her on-screen persona has all been an act

Hilton's sister, Nicky Rothschild Hilton, and their mother, Kathy Hilton, will also be part of the documentary.

Hilton said filming over the course of a year was very therapeutic.

"I became so close with the director, and she really asked me so many questions," she told The Talk in March. "I started thinking about my past and what I've been through and realised just how much it's affected my life and how I was holding on to so much trauma for so long.

"I think when people see this film, they're really going to see a different side to me than they've ever seen before. Because I honestly didn't even know who I was up until this year. I really learned a lot about myself through this film."

This Is Paris premieres September 14 on Paris Hilton's YouTube Channel.