Ebenezer Scrooge did not have a happy life. He was rich with money, but was poor in many other ways. He had a lonely existence and couldn't feel joy.
When Scrooge's nephew Bob Cratchit wishes him a "Merry Christmas," Scrooge responds, "Christmas is just another day." He spouts "Bah humbug!" to anyone who shows the holiday spirit.
All of Ebenezer's days seemed the same to him - work, eat, sleep, and be grouchy. He bemoans buying presents, complains about decorations, hates carol singing, and shuns family gatherings.