Hmm, well, to look at it another way--if this person weren't in a position to do something important or interesting, no one would be telling his or her story. Everyone's the hero of his or her own story, but what is it about this person's that makes it interesting to others?
As for saving the world, while this is a thing in epic fantasy, not all fantasy is epic, and not all epic fantasy hinges on the actions of just one person. Some stories are about simply saving oneself, even, or about becoming a part of something larger than oneself.
Think of some of your favorite fantasy titles, both classics and more recent. In each case, what happened that launched their protagonist(s) into a life of adventure? Sure, the chosen one/prophecy angle is there in some (though it's been done so often many readers are tired of it), but it's not the prophecy itself that makes the person special or gives the person his or her skills.
Generally, there's some ability they have, or some action they perform, or some choice they make, that makes them unusual in the way the story requires. Sometimes a story simply starts by the protagonist being in the right (or wrong) place at the right time and overhearing or witnessing something. Sometimes the story starts with him or her a victim and vowing revenge.
A typical story starts with some kind of inciting event. This is something that disrupts the protagonist's normality and starts the plot wheels turning. A little further in, there will likely be a plot catalyst. This may be an action, or a choice, or even a relationship that marks a point of no return for the character.
You may want to research the terms inciting event, plot catalyst and hero's journey (a common sort of plot in epic fantasy, though there are plenty of others out there too). They may give you some ideas.
Happy writing.