The 33-year-old actress won the award for her portrayal of prostitute Fantine in musical "Les Miserables," reported ET online.
"I felt very uncomfortable. I kind of lost my mind doing that movie and it hadn't come back yet. Then I had to stand up in front of people and feel something I don't feel which is uncomplicated happiness. It's an obvious thing, you win an Oscar and you're supposed to be happy. I didn't feel that way," Hathaway.
The actress said she felt awkward standing on the stage dressed in super expensive designer wear which may have cost more than the amount of money a poor man will see in his lifetime.
"I tried to pretend that I was happy and I got called out on it, big time. That's the truth and that's what happened. But what you learn from it is that you only feel like you can die from embarrassment, you don't actually die.