Selena Gomez Blasts Her 'Grown-Up' Haters: 'What Were You Doing at 21?'

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The usually super-sweet Selena Gomez, 22, is fighting back against her haters -- specifically, the "grown-up" ones.

Promoting her new film Rudderless, Gomez had a message for the some of the judgmental adults constantly criticizing her.

"I get picked on by grown adults all the time," she recently told E! News. "It's grown-ups and I don't get it. It just baffles me. I wish I could just sit them down and say, 'What were you doing at 15? What were you doing at 18? What were you doing at 21?' Because I can guarantee you it's not half of what I've done.'"

VIDEO: Selena Gomez -- 'I'm Still Trying to Figure Out Who I Am'

Gomez has taken her fair share of Internet hate recently, specifically due to her seemingly endless on-again, off-again relationship drama with Justin Bieber, 20. It was also revealed earlier this year that Gomez had checked into rehab at Dawn at The Meadows in Wickenburg, Arizona, but was only reportedly in the treatment facility for about a week.

During an appearance on The Ellen DeGeneres Show Monday, Gomez acknowledged that she's still working hard on herself. When asked to rank her progress on a scale from 1 to 10, she responded that she's "a seven."

"You know this year's been... I feel like I have been doing this so long that people tend to forget that they're all like, 'be yourself, be yourself', and I'm still trying to figure out who that is," she admitted.

Though she does know that she wants to continue taking more challenging film roles.

"Lately, I've been begging people to just take an audition with me," Gomez surprisingly told ET at the Rudderless premiere on October 7.

As to why she decided to take on Rudderless, out this Friday, the answer was simple.

"[The script] is extremely touching. It's amazing," Gomez said. "And I want to be part of a cast [which includes William H. Macy and Billy Crudup] that I can learn from. I think that's important for me."

VIDEO: Selena Gomez Explains Her Cryptic Instagram Posts

Check out ET's full interview with Gomez in the video below!