The “Les Miserables” actress discussed the pros and cons of the glamour industry with Britain's Elle magazine, reports femalefirst.co.uk.
"This fame thing? F***ed me up for a really long time,” she said.
The 31-year-old actress also mentioned that she had no idea how to cope with life in the public eye.
"I didn't know how to do it; I didn't know how to engage with it; it stressed me out. And people would say, 'You just have to be yourself,' and I was like, 'But I don't know who that is yet!'," she added.
Hathaway, who is married to actor Adam Shulman, has now realised that she doesn't need validation from anyone but herself and says that knowledge has made her life much easier.