Carrie Underwood may have won “American Idol” and a Grammy — but she hasn’t let it go to her head.

“I don’t consider myself sexy … I’m kind of a nervous person in general,” Underwood, 25, admits in the July issue of Cosmopolitan.

“I’m socially awkward,” she adds. “I’m not tall and sensuous. I usually wear sweats everywhere I go. Oh, and I burp a lot.”

Underwood, an Us Weight Winner, has dated her share of good-looking guys, including “Gossip Girl’s” Chace Crawford and current Jessica Simpson beau Tony Romo.

As for their splits?

While she doesn’t name names, she says, “Cheating is a deal breaker - If you cheat, you’re gone.” Underwood, who told “Extra” her April break up with Crawford was over text, doesn’t believe in plotting against her exes.

“Getting revenge on a guy is just not worth it to me,” she says. “The best revenge I can think of is becoming famous.”