02/28/2008 at 01:00 PM EST
is opening up about his arrest for trespassing
at a Chicago Wallgreens last November, saying he is "embarrassed" about the incident.
"That was complete and utter insanity," LaBeouf tells Empire magazine
. "I was an a--hole, and it was a mistake I'm still completely embarrassed about."
By way of explanation, the Transformers
star, who appeared intoxicated and refused the leave the drugstore at the time, says, "I was in the middle of a strange mind state, having just come off a three-month window of focus. I can't diminish what happened at all. But I can say this: I'm not the first 21-year-old to be arrested for a misdemeanor. There are lessons in life I need to learn, and I'm learning all of them in front of the public."
The actor, who's only spent two weeks off of work in the last three years, according to the magazine, says he got into showbiz to work not play.
"I feel like a better person when I'm working – I enjoy it more than anything else in my life. And the pool-party, tons-of-chicks, binge-drinking bulls--- – that's not what I got into this for."
In December, the drugstore reportedly decided not to press charges
against LaBeouf, who says he's "still learning how to cope" with fame, but is optimistic about his ability to stay grounded.
"Things are amazing for me now, and then it won't be amazing," he says. "As long as you keep a level head … then you'll be okay."