"It was difficult," he admitted to Newsround's website. "It was cold and wet - it was an experience. But if you accept help, things can change, you can turn it around.
He said it was important to get away from the traditional image of a homeless person.
"People automatically think of old men sleeping rough on the streets, you don't necessarily think of a young person who's found themselves in a tricky situation.
"My message to young people is ideally don't leave home. But obviously if you're in a situation where it's impossible to stay at home, there is help out there. You don't have to stay on the streets."
Norman, Jamie's character, has had a hard time lately, dealing with his brother's death and homelessness.