Happiest people in medical field ?

23M intern, after going to various departments I feel many of the consultants and APs in various departments are not happy with thier life, most of the times they are frusted nor they have any interest in teaching young doctors. What is that branch where I am most likely to find happy people? I just don't want to end up like that ( I would rather choose non clinical for pg and be happy rather than clinical and be frustated all day )