[hijack]This has nothing to do with anything, but wasn’t there a Dutchboy here once? Who, I think, later became Isla. What happened to him? He was a great poster, than just stopped.[/hijack]
As for the OP, I am 17 at the moment as well. It seems pretty natural to some people to feel like they have a purpose, that their life has some underlying meaning, and all they need to do is find it. This is rehashed predeterminism, so I generally discredit this feeling.
Then, there is another common feeling, that of which makes the victim feel like they have something great to share, that they are the best that has ever lived in one subject or another, and/or that they have something so profound inside of them that society will be utterly revolutionized once they share it. Most people grow out of it, once they realize they are brilliant and talented and magnificent just like the rest of society. Some will actually revolutionize society, but they are definitely the minority. The rest never grow out of it, and usually evolve into an egocentric adult, what most modern standards deem an asshole.
As a teenager, though, these feelings are normal. Maybe you have something profound to say. How will you know until you say it? Try to figure out what you are trying to say, speak clearly, and then let the world be damned.
For me personally, I have had these feelings as well, but I usually don’t listen to them. I know that I will be the greatest theoritical physicist director mathematician that has ever lived.