Life mission is what God created you for, is the reason why you were born, is the real and original value of you for the world.
There are too many people in the whole world can not find their life mission, that is why they keep looking and changing their jobs, and that is why they lost their life mission in tracing money, ladies, power or any other kind what does not belong to their life mission.
Before people find their own life mission, people are always passive, selfish, irritable, narrow-minded, craven and worried, they can never enjoy their life.
To find your life mission is not that difficult as you imagine:
You can get any kind of thing what you are really interested in, keep doing it at least three years more, then you find you are really good at it, and you can enjoy what you are doing. Congratulations, you have caught your life mission.
If you keep doing it three years more, you find you are really not good at it, and you can not enjoy what you are doing. Sorry, you have to find other kind of thing what you are really interested in and keep working again to see.
In short, if you are really interested in it and after at least three years of focus, you are really good at it, then it is your life mission.