The Eat Pray Love actress was asked by Access Hollywood Live to recall her teenage years.
The Oscar nominee said: "[I was] just mediocre, just getting through the hallways with my girlfriend Paige."
She added: "We weren't losers, but we weren't popular, we were just coasting, that is exactly what we were doing."
Her friend, Paige, is now her daughter Hazel's godmother.
Roberts will be seen playing the Evil Queen in the upcoming Snow White film, starring Lily Collins as the fairytale heroine and Armie Hammer as Prince Andrew Alcott.
Roberts's Evil Queen was shown for the first time in new Snow White pictures released last week.
The Snow White film will hit theatres in March 2012.