What do you call someone who keeps things to themselves?

Answer 1

A selfish man,woman or child if you mean that they keep things to themselves like a lot of food,water etc.

Answer 2

A private person perhaps. 

Answer 3

Introspective, introverted, a private person, loyal, ?

Answer 4

Material things? - selfish

Information? - secretive, careful and depending on the situation maybe paranoid