Emma Watson admits her first years at university ''weren't easy''.

The 22-year-old actress began her studies at Brown University in 2009 and admits the American establishment was tough because she didn't get to spend much time with a solid group of friends.

Emma - who recently completed her third year at Oxford University in South England - said: ''My first two years at Brown weren't easy, not because I was bullied or because anyone gave me a particularly hard time, but just because, you know, without the collegiate system . . . and at Brown everyone does completely different things and very much chooses their own path, which is great, but it's also much more difficult, too. You're not with a group of people all the time at one time.''

The British star - who shot to fame playing Hermione Granger in the 'Harry Potter' film series - admitted her success makes it difficult for her to go out in public unnoticed.

Speaking to T: The New York Times Style Magazine, she said: ''If I went to somewhere busy, I wouldn't last very long. I can't go to a museum, I'll last 10 or 15 minutes in a museum. The problem is that when one person asks for a photograph, then someone sees a flash goes off, then everyone else sort of... it's sort of like a domino effect. And then very quickly the situation starts to get out of control to a point where I can't manage it on my own.''