The 27-year-old's divorce from Ryan, 35, was finalised in July but she insists it would be a 'waste of time' to regret their two-year-union.
The We Bought a Zoo star told US entertainment show Extra: 'I don't believe in having any regrets. It's a waste of time to regret anything. I own all of my decisions, and I've led a very charmed life up until this point.'
Despite having no regrets, Scarlett says she's had a challenging 12 months.
She told Access Hollywood: 'I've had ups and downs. Certainly, this past year has had a lot of unexpected things in many beautiful ways, many challenging ways.'