Everyone knows about the fact that Twilight star Robert Pattinson is dating Dylan Penn, and it shows that he has already moved on from his past relationship with Kristen Stewart. However, it seems that Rob is yet not totally attached to Penn, and even the latter herself confessed that she has her own inhibitions in getting serious with him. It is learnt that the 22-year-old model fears of losing her own identity, as she doesn`t want to be known as Rob`s girlfriend.That’s the reason she is afraid of being serious with him as it will directly mean losing her privacy. "She doesn't want to be known as Rob's girlfriend," the source says of the 22-year-old daughter of Sean Penn, 53, and Robin Wright, 47. "She's afraid to get serious with him and lose her privacy."Meanwhile, on the other hand, it is also learnt that even Rob himself doesn’t want to get into serious business of dating, and is just enjoying himself. "Rob isn't ready to be exclusive with anyone right now," an insider says. "He's just enjoying himself," said sources close to the actor, who ended his relationship with Twilight co-star Kristen Stewart, in May!We hope he finds his soul-mate soon!