A drive-by shooting looked like the end of the world for a Chicago teenager living the gang life and “going nowhere.”It turned out to be the beginning.“It is the greatest thing that ever happened to me,” said Will Waller, now 38 and a successful business executive and gold medal-winning athlete.“Without a gunshot wound at 18, I wouldn’t have had the opportunities,” Waller said of a list that includes attending college, entering wheelchair sports, traveling the world and meeting his future wife and raising a family.Waller, then 18, was seated in a car in Chicago when a bullet struck his right side.