"It's really easy to fall for someone on-set, but in the end you know, it's a representative and it's not really them," the actor, 21, tells Vanity Fair in its August issue.
Instead LaBeouf tends to meet girls through his friends. "There have been real innocent dates," he says. "They haven't been, like, 'Come to my house and I'll make you some food and we'll caress and put on some D'Angelo.' I'm not that smooth."
But that doesn't mean he hasn't found a girlfriend on a movie set. LaBeouf tells the magazine that he's still not over his first love, a producer's daughter named China Brezner, whom he met when he was filming The Greatest Game Ever Played.
"We were inseparable," LaBeouf says. "She was my best friend and my love."
As for how he's coping since the breakup, he says it's "like rebuilding after a tornado."
But LaBeouf, who is currently working on the upcoming Indiana Jones sequel, is staying focused on his career and even opted to skip the college-age tradition of getting drunk on your 21st birthday, which he celebrated on June 11.
"I won't have a sip until after Indy," he says. "People say, 'What are you doing for your 21st birthday, Shia?' And I'm like, 'I'm making an Indiana Jones movie.' What's better than that?"