02/29/2012 at 01:00 PM EST
Jennifer Lawrence doesn't suffer fools.
The no-nonsense actress, who stars in the highly anticipated
upcoming movie The Hunger Games
, is clear about a few things she doesn't like: phonies, actors who complain, and people who say they love
"I hate saying, 'I like exercising.' I want to punch people who say that in the face," Lawrence tells Glamour
in its new April issue. "But it’s nice being in shape for a movie, because they basically do it all for you. It's like, 'Here's your trainer. This is what you can eat.' "
But she hasn't succumb to pressure from Hollywood to be super thin. "I don't diet," she says. "I do exercise! But I don't diet. You can't work when you're hungry, you know?"
Work is the main thing on Lawrence's mind these days. With the release of The Hunger Games
next month, Lawrence, who plays the lead role of Katniss Everdeen, is aware that her stardom is about to rocket into another orbit.
"I feel like I got a ticket to go to another planet and I'm moving there and there's no turning back, and I don’t know if I'm going to like that other planet or have friends there," she tells the magazine. "It's daunting."
Already her life has started to change – but it hasn't gotten out-of-control yet.
"The people who used to ignore me at parties, now they're nice to me and kissing my a--," she says. "But nobody's staked outside of my house. I wanted to make sure that when I said yes [to the role], I wouldn’t regret it. And I don't regret it. I would have said no because I was scared, and then I would have been that bitter actress telling my grandkids, 'I'm the one that turned it down.' "
As for the perks of fame, "I’m doing what I love, and then I get months and months of rest," she says. "I have a lot of money for a 21-year-old. I can't stand it when actors complain."
Plus, she says with her newfound success, she doesn't have to restrain herself when it comes to certain (relatively) pricey treats.
"Just recently I started letting myself eat things from the minibar," she says. "When we were kids, we would never open the minibar. A $6 Snickers bar? But the other day I was in a hotel and I was staring at a Snickers bar, and I finally just ate it. Then it was like something in me snapped. I opened all these drinks. I thought: I can do it now. Now I'm all grown-up. I can eat things from the minibar."