The actress - who will play Miss Moneypenny in new James Bond movie `Skyfall` - attended one of Britain`s most prestigious colleges, Cambridge, but didn`t enjoy her time there because she didn`t fit in.
She said: "I really hated it. I imagined staying up all night discussing the meaning of life. Everyone told me I`d meet my future husband there, too.
"People used to drink and drink and drink until they threw up all over the college grounds - where`s the fun in that? It was one of the worst periods of my life. The people there were so different to me and I couldn`t connect with them on any level. They talked about Eton and skiing and here was I, this black girl from North London.
"I didn`t envy them; I was quite sorry for them. But I just felt so lonely."
Naomie also revealed she is very health-conscious and likes to look after herself but says she once got very ill when she tried to follow the raw food diet.
In an interview with the Daily Mail newspaper, she said: "Yes, I`m obsessed with health, which has been an interesting journey. I went down the raw-food diet route, but got ill. It was really hard, especially in Britain in winter, trying to survive on raw carrots. I became so ill and anaemic, so I stopped that and became a vitamin junkie. I just ate lots of vegetables, exercised and breathed."