"I keep feeling like my eggs are dying off," Seyfried admitted. "I need to get on it. I want a child. Badly. I want to be a mother, badly. That's what I feel. I've been feeling it for like, two years."
That being said, Seyfried -- who is currently dating actor Justin Long -- also confessed that she's not so sure how prepared she is for motherhood. "I'm not ready but nobody's ready. It changes everything," the actress added. "So how you can ever be ready for that?"
While Seyfried works on her personal goals, her professional life is taking off. The actress took over as leading lady for Mila Kunis in Ted 2, but disclosed that she was nervous about replacing the Black Swan star.
"I'm convinced people are just going to go, 'Where's Mila?' And listen she's got a lot of fans," she told the women's magazine. "One of my favorite things about my relationship with Seth [MacFarlane, director] is that I make him laugh. Maybe he's just laughing to make me feel good but I genuinely seem to make him laugh and that brings me a good amount of joy."
Seyfried plays a marijuana smoking lawyer in Ted 2, but recalled that after portraying the ditzy friend in Mean Girls, she started to feel typecast.
"I kept getting scripts for big-boobed blonde idiots. I could have so easily been Karen Smith my whole career," she said. "I realized that if I really wanted to work forever I was going to have to make the right decisions.… That's why I've made some tough decisions too, I've turned down some pretty big stuff. I didn't want to be an action hero or in a f**king green suit for like, 10 years, because I don't want to be miserable. I think happiness comes from being free."
Seyfried constantly works on her happiness, and admits that she's been to therapy.
"It's coping with life. I've been told to not talk about it, but [anxiety] is so very common," she said. "I just think, you go to your doctor about heart problems, or an eye doctor if you have an infection, you have to take care of yourself. Mental health is so segregated, it sucks. You don't necessarily have to have something chemically wrong with your brain to have mental health issues."