The 22-year-old had faced the ire of fans and was criticised publicly when she was caught cheating boyfriend Robert Pattinson, with director Rupert Sanders.
However, Pattinson and the actress reconciled after brief split. Stewart says she knows she cannot shut herself away from the world.
"I have realised that you can close yourself off to life if you put walls up, but it's a difficult thing," V magazine quoted Stewart as saying.
"You can't see over people, can't see in and you also can't see out. So I have gotten quite comfortable with being unafraid. I keep saying the same thing, it's not about being fearless but really just embracing the fears and using them," she added.