Drew Barrymore has revealed that she sometimes can't shake the little girl inside her.

The 37-year-old and new mum has come a long way from her turbulent days as a Hollywood wild child, but admitted there are times when she feels like she's just playing the role of a responsible adult.

"The mistakes, the potholes, the journeys, the bad patterns - all of it is so much clearer to me now... but I still don't totally feel like a grown-up. Maybe I never will," she told Allure.

Drew - who has won a Golden Globe gong, has her own production company and a star on the Hollywood Walk of Fame - said being a mother to daughter Olive has changed her perspective on life.

"I will always commit. I want to be that kind of mother. I'm that kind of friend. I'm that kind of producer," she said.

"I do everything in this life-or-death way. The only thing I've tried to get better at is starting to believe maybe it's not life or death. But the [level of] commitment hasn't changed or wavered."

Drew, who is married to art consultant Will Kopelman, loves being a married woman, saying: "I'm a Kopelman now. I have stationery that says Drew Barrymore Kopelman."

She added: "We have opposite experiences, but we're not opposites. We're both very particular and detail-oriented. We love art and music and adventures, and we laugh our a**** off together."