Well, time to post some unclear blabbing of mine again ^^.
Anyway, I personally don't think that anything has determined any reason for existence, by this I mean overall, like the God making us because He wants an utopia or something like that. No, that most likely didn't happen. I believe there is no predetermined reason, but in addition every person is able to make one of their own reasons. So, what I'm trying to say is, that while wondering about a overall reason which most likely doesn't even exist, they should be out there making their own reasons, creating goals and making viewpoints, to make their own reason of their own liking. I mean, what fun would be to just exist because some entity thought that. This is a free world after all (though only in it's sick and sad little way).
Anyway, the point is that the reason of ones existence is what one determines it to be, no-one has the right to determine your's, and you have no right to determine anyones.
Okay, now something I put after my every post just out of obsession:
The text and grammar are probably a bit unclear but that happens when you're young with a native language as peculiar as finnish, so don't mind, and if you didn't don't mind about this last sentence.