I ticked a list of goals, one by one. I achieved all my goals, now I know not the goals but the milestones are the keys for fulfilled success. But, What is the source of "setting goals"?  Who pushes us, us?

By nature goals contain satisfaction and milestones are more holistic which gives more freedom to create by accidental happenings as well. From "romantic books or goals" to a question of comfort "How would I like to die?".  Knowing that I will die is a liberation and seems like there is a way serves the best death option for me.