I think thats a pretty common question to ponder about. What you want from life is "happiness" and "satisfaction" a/c to me. These are the two things we will be chasing till the last day of our life.
Take real life examples:
-Why did you come to US? In the hope of having a better life which will make you happy and satisfied.
 - Why do you want to fall in love with that guy? Coz you will be happy and satisfied with his presence.
- Why do ppl move back to Nepal eventhough they make tonns of money? coz they are not happy with their life here and are not satisfied      with the direction their life is going.
- Why do I try to hit a hot chick in a bar? Coz i want to have sex with that lady which will make me happy and satisfied even for a while. 

People try to be happy and statisfied in various ways. Some choose illegal route and pose a problem in the society. Why do Habsis try to rob you? Why do Mexicans risk their lives to cross the border? Why do we work so hard for Indians? Why do we all come in sajha?

At the end of the day, "happiness" and "self satisfaction" is what we have been longing and chasing all our lives and it wont stop till the last minute.