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"Like, if you're watching The Hills or 90210, all the backstabbing shapes the way we act," the Seventeen cover girl says in the magazine's October issue.
"I mean, I love Blake [Lively]; she's a wonderful friend of mine, but shows like Gossip Girl kind of condition us to be mean."
The Ugly Betty star, 24, says she has managed to keep her own friendships – especially with her Sisterhood of the Traveling Pants costars – cat fight-free.
"One of the most wonderful experiences I've had with girl relationships was working with them [Lively, Alexis Bledel and Amber Tamblyn] on Sisterhood. I'd worked with other girls before and it was pretty catty," said Ferrera, who counts Tamblyn as "one of my closest friends."
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Note that this week’s cover of PEOPLE may differ regionally
