October 05, 2016 02:19 PM

Rob Kardashian is uncomfortable with his weight – and he’s opening up about his insecurities on Rob & Chyna.

In a sneak peek at Sunday’s episode, the reality star tries on clothes with stylist Jen Rade and Scott Disick in anticipation of a trip to Cannes he was planning on taking with fiancée Blac Chyna.

“These don’t fit. I can’t even button them,” he says in the clip released by E! News.

The stylist hands him more options and reassures him that sometimes it can take trying on 20 pairs of jeans to find one that you like – but Kardashian sighs, appearing frustrated.

“I mean, everything can be tailored,” chimes in Disick, 32.

Kardashian, 29, then confesses he’s rethinking his promise to fly to the south of France with Chyna, 28.

“I do not want to go to Cannes anyways,” he says. “Even when I was in the best shape of my entire life, I still had an insecurity with my weight.”

“On top of that, there’s paparazzi people that follow me and take pictures of me and that shuts me down to not wanting to go out when I’m obviously not feeling my best,” he continues. “I’m not comfortable in my skin, I’m not comfortable with this weight. So I feel like I’m not happy with anything I do right now.”

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Rade has Kardashian try on suit jackets next, but the reality star quickly makes it clear he won’t be wearing one “for at least six months.”

“Even in Cannes? For any kind of meeting?” she asks.

“I’ll never wear a suit,” he repeats.

“Even a linen?” she pleads.

“No. I’ll only wear a suit on this coming New Year’s,” he says.

“Okay,” says Rade, hesitating. “It just seems like the point of this was to try and break you out a little bit.”

“It’s not you, I just won’t be happy – period,” Kardashian says. “That’s just how I am.”

Rob & Chyna airs Sundays (9 p.m. ET) on E!

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