Ive been thinking about this for a while now and it doesn't necessarily pertain to me since im not above average.
But ive noticed that while the truely gifted can sometimes be extremely ostracised and find themselves all alone, often their intelligence can make up for it and project them into unforseen heights of success, (depending on how you rate success of course).
However those who are only slightly above others in their intelligence, might often find there is no outlet for them, no future and no real options. The reason I say that is from what ive observed such people are just intelligent enough to feel apart from those around them but not so intelligent that they can break free of the same trappings that most people find themselves in.
Such a person might even have to suffer a horrible, torturous existance because they are knowledgeable enough to know that they will never reach the heights that others are able to.....and therefore they remain forever tormented by a crystal clear view of their own limitations.