Carrie Underwood has five Grammy awards, she's sold more than 11 million albums and has notched eight No. 1 songs thus far in her career. She's also preparing for her first major film role, and headlining a sold-out tour, all while planning a wedding to hockey player Mike Fisher.

But while most people might feel a huge sense of satisfaction -- and maybe a little bit of arrogance -- with all of that happening, Carrie says her success actually makes her feel guilty!

"I think if anybody in my position felt like they deserved it, there'd be something wrong with them," the season four 'American Idol' winner tells Allure magazine (quote via FOX News.) "Because going through Idol, just that process, going to Hollywood and seeing all those people, there were beautiful women who were talented, and for some reason or another, they didn't make it and I did. I'm grateful, but I guess I'm a little guilty."

While the show was the launching pad for her widely successful career, Carrie admits there is still a power struggle between previous winners and the powers-that-be. "People think they have us under lock and key for the rest of our lives," she says of the 'AI' executives. "If I don't want to perform on it, I don't have to ever again. Of course, I will because I'm not a little snot."

Carrie admits that her fame does come with an especially high price tag. "I'm horrible in crowds," she confesses. "I just get so nervous. This happened to me when I was in high school, before all of this. I would start having panic attacks in Wal-mart. I do not like shopping in close quarters and stuff like that; I just can't do that. This is my space," she says, drawing an imaginary boundary around her, " and I'm really weird about it."

One thing that doesn't make her insecure is her upcoming nuptials later this year. "He is the person that I see making me happy for the rest of our lives," she gushes, "and he is the person I would do anything for to make him happy. I very well may be the luckiest girl in the world."

Carrie, nominated for four ACM Awards, is currently headlining her Play On tour, with opening acts Sons of Sylvia and Craig Morgan.

Download Carrie Underwood Songs

Carrie Underwood on AOL Music