AceShowbiz -

Khloe Kardashian opens up about her body image issues in an interview with PEOPLE's latest issue. "Growing up, I was always chubby," she tells the magazine, "But I was still always in sport. I was still a healthy active kid."

The 31-year-old reality star says she's "an emotional eater." She "gained weight" after her parents got divorced, but she then began losing weight when growing up as a teenager. "My girlfriends were always running around in two-pieces and I never felt comfortable to do that," she shares.

Khloe didn't realize she was the "fat" sister until she appeared on "Keeping Up with the Kardashians". "Right before the show started, I thought I was in good shape, but I guess not good enough for Hollywood's eyes," she says, "I didn't realize I was the 'fat' sister until I went on TV and the media started saying that about me."

"Being compared to my sisters was something I was used to. But being compared in such a harsh way," she continues. "I just thought, 'Okay, that's my role.' So I started saying it before people. I was like, 'Okay, I'm the fat, funny sister. Who cares?' I almost let that take ownership of me. [In reality] I wasn't fat; I wasn't obese. But I would let society make me believe that I was."

However, Khloe says she felt comfortable with her own skin. "I knew I didn't look like my sisters and I didn't have those shapes, but I didn't think that was wrong," she explains, "I had parents who were incredibly loving and nurturing and always made me feel beautiful so I never really questioned that."