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Jennifer Aniston has a long history of memorable comedic roles, but the "Friends" star is frustrated when she's asked one specific question about her roles.

"Something about family and trying to relate it to the movie with, 'Oh, if I was to have a child how many kids do I want?' And 'do I want a boy or a girl?'" Aniston said in an interview with ABC News correspondent Amy Robach.

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"I didn't realize you could place orders, I honestly didn't realize it was like a drive-through, that you could talk to a little electronic voice," Aniston said.

Aniston, 44, admitted to Robach that she had doubts about her latest role in "We're the Millers." Her character is a down-on-her-luck stripper who agrees to help a small-time drug dealer (Jason Sudeikis) smuggle a marijuana shipment over the Mexican border by posing as his wife. The fake couple also have two fake children who were recruited by Sudeikis' character.

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Aniston said she initially said yes to the film, but then doubt set in.

"I said yes thinking 'wouldn't that be great,' thinking, 'well, I've never played a stripper, at least not in film' … then this panic sets in three weeks, two weeks, one week before the actual day of shooting," she said.

Aniston worked out an hour a day, six days a week, to get ready for her stripper scenes.

"Honestly it was the craziest workout," she said. "My diet has always been pretty clean but I think I was super, super strict, especially in terms of, I'll usually cheat once or twice a week and I just kind of didn't."

Despite the adult content, the racy comedy has heart and a family-centered theme.

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Asked if the film made her think about what family means to her, Aniston replied: "Well, what family means to me is the family I've chosen … and my friends and my partner are truly my family."

Aniston is engaged to be married to actor Justin Theroux. Since the engagement was announced last year, there has been speculation about why the pair still haven't announced a wedding date.

The actress says she doesn't focus too much on those rumors and the inordinate amount of public interest in her private life.

"I surround myself with my amazing work, my amazing friends, my amazing partner, my beautiful dogs … and I tune that noise out. I mean, I think it's very sweet that people want everything for me," she said, adding that she's "so content and happy" where she is.

Given how the star feels about all the attention she gets, don't expect to see her on Twitter anytime soon.

If she joined Twitter, she said she would "really send people over the edge" by trying to correct "every false rumor."