I definitely do not agree that each person is born into this world to do a specific thing, that's a silly thing to think. For one, I would find it pretty sad to be put here to do one specific task. Seems like an underutilization of resources, God.
I do think that to have happiness you must have purpose. Purpose, in this case, is not an intrinsic mission you're sent on from high, it's what you yourself are striving to do. My purpose is to be a great computer programmer. One's purpose can change, too. For example, when(if?) I have children, perhaps I'll develop an additional purpose to be a good father.
There's already been a lot of argument in this space by philosophers going back thousands of years. It might be helpful to go back and take a look and see what folks smarter than you & I have come up with.
Most amazing jew boots
85242
35212
ramoth