The `Amazing Spider-Man` star - who spent two years in therapy as a child and still has sessions when she feels she needs them - admitted her mortality scares her and she tries to seize every moment because it could all end at any time.
She told Style magazine: "I`m close to my mortality, not in a freaky way but constantly. I feel hyperaware that everything could end. That`s always been in my mind, for whatever reason, since I was very small.
"I was in therapy for two years as a kid. As someone with anxiety you`re constantly waiting for the next attack.
"I think I tend to worry more when things are good. I know those things will change."
While Emma, 23, is open about getting therapy, she prefers not to discuss her relationship with `Spider-Man` co-star Andrew Garfield because she wants to keep it private.
She explained: "Honestly, the only thing that gives me any release is knowing what I have the power to say. If I never address anything, how much can anyone ever really know the truth."