How to be contented in life??

Why it is so many people are not contented in their life? Even though they are rich and have a lot of money, they can do what they want, have all things going on with their life. They have a nice car, a big palace house, they can buy what they want, they can do whatever they’ve wish for. But still something is missing..

What is missing? sometimes i just think of the things that i have before, but i didnt took care of it until its gone... and then regret of it everytime i remember... But, when bigger problems came my way it became a lessons for me.. and now i always see to it that i wont do such things that i will regret to the end... there are ways on how to be contented in life... first thing is that you must learn to accept what you have but don't stop to achieve more... accept what is happening to your life cause if you dont no ones going to accept it for you. try to be better your self and achieve more.. Secong thing is that Material things is not the measure of who you are. don't be materialistic too much. material things can vanish with the split of time with no warning.. and the last thing is that you must learn to appreciate everything you have. sometimes we forget the little things that make us happy, we are focusing alot on the big things. it is nicer to stop for a while and look and observe everything around you.. And yes there are so many beautiful things around you and all those things can be worth noticing. learn to appreciate. :)