Burnout is a condition that is very much the result of work stress (which has not been successfully alleviated). Most of the time it creeps up on you quietly and at first glance it may appear to be just a major case of stress.
Everyone is a leader! We lead everywhere in our lives - at home, at work, in our friendships, in our self-care, and so on. We are in various leadership roles and there is no escape from them. We are leaders as soon as we get into a team. Leaders of ourselves.