The actress, who appears on Nylon's March cover, admits she finds herself craving characters who push boundaries – all roles that are a far cry from her daily life as a wife to Cash Warren, mother of daughters Honor, 5½, and Haven, 2½, and the co-founder of The Honest Company.
"I don't have to be a boss; I don't have to be a wife; I don't have to be a sister," Alba says in the magazine's spring fashion issue.
"It's been liberating to be able to play someone who's a badass or promiscuous because that's the opposite of who I am ... It's like a drug."
But stepping outside of her comfort zone is still seemingly new for Alba, who adds she was always one to play it safe in the public eye.
"Before, I was so fearful of failure and judgment that I was scared to put myself out there," she says.
Marvin Scott Jarrett
And if by chance, the 32-year-old – who "used to be so hard on myself" – stumbles, there's always an opportunity to start fresh.
"You have to realize that as along as you don't make a habit of it, tomorrow will be here, and everything will be okay," she says.