Mark Wahlberg has been a juvenile delinquent, underwear model, leader of the Funky Bunch, actor and producer, but today told 'Good Morning America' (Weekdays, 7AM on ABC) that he doesn't spend much time looking back on the past.

Wahlberg, out promoting 'The Fighter,' which opens tomorrow, is happy for his success, but wants to stay focused on the work. "I'm always figuring out, how do I maintain it and how to I go to the next level," he said. "That's why I start my day, every day, unless I'm on 'Good Morning America,' right after I wake up, getting on my hands and my knees and thanking god and asking for the strength to do the right thing."

Wahlberg also mentioned he was happy to have inspired kids who grew up in situations similar to his growing up to reach for something more. "If I can do it, they can do it," he said. "Nothing is impossible."