There are some people who believe that no one should be trusted and the world is full of liars. They usually feel this way for one of two reasons :
1- they tehmselves are habitual liars and they assume that everyone else is just like them.
2- they make it difficult for others to tell them the truth because others can see how aggressively or emotionally they react to the truth.
If you feel everyone around you is lying to you, you need to examine your own behaviour and attitudes first- the other person is only half of the equation.