Simple, You were a general in the mandalorian wars and have lost touch with the force. As you progress through the story, you learn more about how you lost touch with the force and you learn more about your own past. Whether you want to try to redeem yourself or not is up to you. You are considered "a wound in the force" because you were able to turn away from the force and able to turn away form war as Kreia puts it "All that were at Malachore V were consumed by war, consumed by power, save one. Why, because you were afraid" and people are trying to find out why and how you did it and where Revan is.
Like cool stuff? join my team the dragon kingdom. Also join my site at : http://www.forumsvibe.com/dragonsnest/