At the heart of many fantasies is the idea of the Chosen One, one who is prophesied to destroy evil, bring balance, etc, etc. Harry Potter, the boy who lived, is one famous example. Anakin Skywalker is another, albeit with a twist. Then there’s Aladdin, Neo from the Matrix, Katniss, Rand al’Thor, Garion, the Pevensies, Richard Rahl, Eragon, Thomas Covenant, Percy Jackson, Emma Swan, King Arthur, Link, Sora, and others who fulfill (or sometimes subvert) this trope. Even Kung Fu Panda does it. Here’s a more complete list: http://tvtropes.org/pmwiki/pmwiki.php/Main/TheChosenOne
There’s also another trope in fantasy: you’re either born with magic or not. Not every story does it, but a lot do, which is strange in a way. What abilities in real life are people born with that other people can’t do? Sure, some people seem to be more talented, but practically anyone can learn any ability (just not all of them). Yet in fantasy worlds, that’s not the case. Maybe because it would be hard to imagine a society full of magic users. Either way, it makes a tough life for the characters who are neither the chosen one nor have magic.
But then again, we never think of these characters, because we are meant to identify with the chosen one. Because the biggest fantasy in the fantasy genre is that we are somehow special. That’s one of the main motivators in reading/viewing fantasy. The idea of magic, at its heart, is of being special. In science fiction, there can be technology that’s so advanced it appears magic. But it’s available to everyone (might need some training, though). Magic takes you to an exclusive club, you might even be the only one with it, even if it takes training to master. It is much more about the individual than a society.
This is true even without magic, per se. Superpowers are the exact same thing, just usually in a more modern context. And then there are the people who get sucked into a new world *cough* Narnia *cough* that they have to save, even though they have no expertise, no knowledge of the area, no magic, nothing qualifying them for the task at hand, but they have to do it, just because. And of course they’re successful, even if they didn’t really do anything. Frodo had to sneak into Mordor because…for some reason, only he could resist the ring’s lure? Not some super stealthy ninja, just a hobbit.
So how do you think that makes the Chosen One’s friends feel? Suddenly Mr. Nobody is Mr. Hero because…no real reason. Either he was born with some power and is just now manifesting it, or he got chosen by…prophecy? Who exactly is in charge of these prophecies in the first place? It’s not very fair. They didn’t actually do anything to earn their place. And even if they go on a big, scary adventure, they’re the chosen one, they can’t die (or if they do, they come back to life).
Now you may argue that they’re like Christ figures, if you’re a Christian. He was chosen before birth, given a special destiny. But the characters in these books aren’t perfect (or if they are, they’re boring) and Christ earned his chosen status through his perfection. The Chosen Ones in stories are doofuses.
Either way, the Chosen One is usually not very qualified (Harry vs Hermoine), not the most powerful (Frodo vs Gandalf (or anyone)), and is usually pretty boring, aside from occasionally being able to provide snarky commentary or gallows humor. Yet they are chosen, while the rest of the world languishes without magic or destiny, serving only as orc fodder when the dark lord tries to hurt the hero by striking at their home.
So to all those non-Chosen Ones out there, who are stuck in dead end jobs, bad relationships, poverty, and bad health, and who don’t get a magical break from their sad lives:
It sucks to be us.