Known for her role in Disney's Wizards Of Waverly Place, Gomez began moving to a faster track as Justin Bieber's now ex-girlfriend.
"It's been a weird transition. You never really know what's right or wrong and you can only do the best you can," she said.
Spring Breakers follows four young women on a Florida coast vacation romp they financed with a diner robbery.
Some of Gomez's young fans were gathered outside the ArcLight Theatre hoping to catch a glimpse of the star. But she warned them not to go inside.
"I think they're really here to see me. I don't think they're here to see the movie," she said. "This was a little bit different. So yes, they shouldn't go see this."
Gomez is also getting attention for her reaction to her split with Bieber.
A break-up song from her new album just leaked on the internet. "Our love was made to rule the world. You came and broke the perfect girl," she sings.