The 29-year-old pop star says she has never found a man who was worth "breaking down" her emotional wall for, but she is convinced she will eventually meet her -Mr. Right-.
She told the USA Today newspaper: "I`ve never experienced certain things, and I think that`s because I have this side of me that is shut off. Because I haven`t found anybody yet to open to that I feel like, `OK, you`re worth breaking down that wall for.` I`ve never found that."
The -Mr Know It All- singer - who was the first winner of -American Idol- in 2002 - admits he music career makes it difficult for her date because she is never in one place for long.
She added: "It`s really hard to date when I`m on four different continents in a week. Even if I do meet a great guy, I ain`t ever gonna see him. There`s only so much you can do with Skype!"
The Grammy Award winner thinks her romantic failings will eventually be a good thing because if she meets the right guy in her 30s she has more chance of staying with him.
She mused: "Statistically, if you wait that long, you`re not going to get divorced."