Article continues below advertisementHarrison Ford has sparked concern among fans after revealing he once struggled with depression so severe he could barely bring himself to enter a classroom - a startling admission OK! can reveal has challenged his long-held image as one of Hollywood's toughest leading men.Ford, 83, the iconic A-lister best known for roles in Star Wars and Indiana Jones, opened up during an appearance on the "Awards Chatter" podcast about a deeply difficult period in his youth, before enrolling in a college drama course.