The third series of her anarchic sketch show has just finished its run, and now Amy Schumer is ready for the big screen. Her first movie is Trainwreck, in which she plays a woman whose father taught her that monogamy isn't realistic. Then having lived a commitment-free life she meets a genuinely nice guy and has to re-evaluate herself.

Bill Hader and Amy Schumer in 'Trainwreck'Amy Schumer stars alongside Bill Hader in her first comedy film 'Trainwreck'

Fans of her comedy won't find that premise so much of a stretch, as it plays on themes the 34-year-old uses in her stand-up. But she was still nervous about making her big-screen writing and acting debut. "I don't think I would have even had the confidence to try to do it," she admits. "But [director-producer] Judd Apatow really encouraged me and made me feel like it was possible."

Watch the trailer for 'Trainwreck' here:

To get through it, Schumer says she only thought about one scene at a time. "I kept it real small in my mind," she says. "We would beat out the scenes, and I tried to think of it like the TV show. In a lot of ways it's more relaxing, because I just get to play this one character."

She describes her role in the movie as a hybrid of the characters she plays on her show. "I think everyone is partially a trainwreck," she adds. "I'm just for some reason more willing to share that with everybody!"

But Schumer is also becoming aware of her own impact on pop culture. "I'm taking this responsibility seriously," she says. "I'm looking at it as an opportunity. What do I want to say? What have I really learned? Where am I, really? I'm not interested in just saying something for shock value anymore. I do feel more of a weight about the message that I'm sending because I know what it's like to be on the other end of that and I don't want to be in denial about what success means. I want to make people feel better."