Actually, I took the celebrity as example, there are many others who are successful according to society's measures and suffer the same problems celebrities do.
It is about finding the success that is most meaningful to you on personal level. Let's think of a family/society that imposes some kind of success on its members. No matter how far they would go with this success it wouldn't feel like the kind one chooses for himself.
The real problem is that people blindly follow the social predefined success without being sure if it is exactly what they want.