Why frustration is there in world, why peoples are not happy with their lives?

Answer 1

Life is frustrating, People are more busy, And more and more people are denying the existence of a Deity. When certain of these people feel unloved or alone there is no one to turn to because people are busy with their own lives. Without a Deity to believe in there seams to be no reason to continue to live and without a reason to live there is an opportunity to do things never before ventured because of fear. These exploits affect other people causing them stress and anxiety.
The Stress and anxiety cause Life to be more frustrating and people to be more busy,
(Rinse and repeat)

Answer 2

If people want happy lives, they should avoid gurus, preachers and shamans.