To a person quite turned aback to existentialities of life, it could be difficult to comprehend Metamorphosis. It was a difficult read (explanation of changed form, esp.)
Kafka has made an analogy between human in depression and trauma (provides insight as to what could probably be going on in the mind of a person caught up in this state) arising from situations like hostility in family wherein the person faces helplessness in spite of being utterly considerate of those around him. Thus making him feel like oneself is something that is dreaded and tried to get ridden off.
Only a strong reason to keep on keep on going that comes with a purpose and not letting go on the part of self and those who dear can make it liveable and possible to move out of that condition.