The 26-year-old rapper has started to doubt the motives of her pals since finding fame and has no idea who she can or can`t trust anymore.
She said: "I`m not a trusting person. I think it`s because I`ve had to deal with so many people letting me down.
"I`ve lost my peace of mind. I no longer know who`s my friend or my enemy. I don`t know if they`re calling me because they like me or because they want a photo op, and that`s not a good feeling. I`m always second-guessing everyone, trying to figure out, `Who is this person, and what do they want from me?` "
The `Massive Attack` singer explained one of the reasons why she struggles to trust her friends was she was recently invited to a pal`s house, only for three strangers to come in and ask her to sign their CDs.
She told BlackBook magazine: "I wasn`t expecting that from one my closest friends."
Despite her frustration, Nicki insists she is still happy to be famous, though she has learned to appreciate that being valued for her work is more important than being recognised.
She said: "I`ve always wanted fame. But when I achieved fame, I started realising that it wasn`t as important as being great at what you do, or being critically acclaimed. Still, I never wish I wasn`t famous."