Since people can't change their destiny, they are born to complete their lives like tasks, like puppets. What is the point of living?

In fact, people live to die in the future, just like you said, to complete the task, to die after a lifetime. This is fate, we can only accept it, as if it doesn't mean anything, but it is also very interesting to think about parents, relatives, happy moments and our own values. People should be happy every day, otherwise, it is not worth dying. Don't think too much about whether he is interesting or not. Just be happy.

I understand your feelings and take your words seriously, because I had the same idea as you before. In life, many things are arranged, destiny and doomed after all. We can't change it. However, we can change our mentality and mood. We can't change our fate. Let him be like that and forget it. Accept it. If you relax and accept your fate, you won't be so sad.