If she's not sure whether it feels right to be with you, then she's not really that into you.
If she wants out of the relationship, give her out. But that means you're out too, you're not waiting around for her.
It sounds an awful lot like what Faster said. Either that or she's seeing all her friends living the "glamorous" American single life, slutting from club to club, and she feels tied down. Could be partly that she's immature, could be partly that your life just wasn't fun for her.
Point is, women come up with feelings first, and reasons after the fact. The feelings are what matter, the reasons are an exercise in bullsh*t.
She feels uncomfortable being committed to you...that's the feeling. Then she concocted this "find herself" reason to justify how she feels to her rational side.