Good begets good ?

Good deeds shall be rewarded with good, and evil with evil. Agree ? Bullshit to me.
There are people who have done many good deeds and yet their lives are full of sorrows and sufferings. On the other hand, there are people who have committed all sorts of evil. Yet, they go unpunished, their lives are without a hitch and they have all their wishes fulfilled. What is this all about?

Edited/
Anyone wanna change your life with me ?
I'm sick & tired of mine.