Bella Thorne Dishes on 'Cool' Love Scenes With Patrick Schwarzenegger

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Former Disney star Bella Thorne is steaming up the screen with Patrick Schwarzenegger in Midnight Sun, and she dished to ET about how she got comfortable with her co-star before shooting some of their more intimate scenes.

"It was the weirdest thing I've ever experience in my life," Bella told ET. "We're running these scenes and all of a sudden he puts his hand on my leg and I'm like, 'Your arms around me. I really didn't see this for us, but okay. I'm going with it. This is cool.'"

WATCH: Bella Thorne on Turning 18 and Being Too Scared to Drive

Bella plays a sheltered teen confined to her house during the day by a rare disease that makes sunlight deadly. Her life is brightened when she meets Charlie (Patrick), who woos her into a summer romance.

Before getting handsy with Patrick, Bella plays a teen struggling with anxiety disorder in the thriller Big Sky, in theaters Thursday.

One thing that gives the 17-year-old actress anxiety in real life is the idea of driving a car.

WATCH: Bella Thorne Is Terrorized in 'Big Sky' Trailer

"People give me the oddest look when I tell them I still don't drive," Bella said. "I'm like, 'Get over it. I still don't drive. I have a fear of driving. I've gone through this so many times.' … I have a car but I'm just so content sitting in the passenger seat."

But the criticism she suffers from not driving is nothing compared to some of the ugly comments sent to her via Twitter and Instagram.

"The harshest thing about social media is knowing what to wear, because if you wear something then it's like, 'Her shorts are too short!' If you take a selfie, it's like, 'You're ugly! Your eyes are too far apart,' or 'Why is your nose like this?' or 'Why are your ears so big?' Everyone on social media is so harsh to each other. It's girl-on-girl and it's so odd to me. I don't know where it came from and I don't know what to do about it to be honest because I don't know how to get these girls to be nice to each other."

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Bella can currently be see on MTV's Scream, airing Tuesdays at 10 p.m. ET/PT.