Purpose of Life

I have a few theories on what is the real purpose of life.

Theory 1:
Purpose of Life is to be happy. You are not special. Be happy - make the world around you happier - play your part in the play - and move on.

Theory 2:
As an individual, we have our own problems and will have some throughout our lives (supporting family, paying off loans, getting a job, securing your job, fighting recession, divorce, death, market crash, business loss, health, health of near ones, etc). I agree that we have to take care of these problems first. But look at the bigger picture. Think of a person seeing us from an outside world. Did we meet the expectations of the world? Did we do what we expect out of us? By fulfilling expectations, I don't mean earning 100,000$ a year at the age of 22. I mean doing something "meaningful". Doing something that would be useful for the country/world/human race.. Leaving a legacy behind. Leaving footsteps that the world would follow.. Providing a new way to live/think/believe. Doing something original. Inspiring people.

Theory 3:
Life does not have a purpose. Anything created does not have a purpose. Creator has a purpose. So, The creator of life has a purpose. So, the purpose of life is the purpose its creator (God) would have while its creation. As far as I can guess, God would have wanted us to live in such a way that we do not disturb god's world. We help it grow. We help it continue. We help it evolve. We improve the world. So, Purpose of Life would be
Help those in need
Reproduction
Be happy and make others happy
Make the world a better place to be in
Change the way people live their lives, hopefully in a positive way

Theory 4:
In Hindu Dharm, there are three types of Rin which must be paid off before one's death: Dev Rin, Pitra Rin and Rishi Rin. Dev Rin is paid off to Devtaa by doing Yagya; Pitra Rin is paid off to Pitar (ancestors) by forwarding one's Vansh (lineage or family line) i.e. by producing a son; and Rishi Rin is paid off by studying.
But Vaalmeeki Jee describes 5 types of Rin while Dashrath explains this to Raam -
(1) Dev Rin is paid off to celestials by doing Yagya and holy sacrifices;
(2) Pitra Rin is paid off to ancestors by producing a son to forward one's family line
(3) Rishi Rin is paid off by studying
(4) Braahman Rin is paid off to Braahman by giving donations and food to them
(5) Self Rin to self by enjoying all kinds of pleasures - means that one is all satisfied from this world.