Cristiano Ronaldo is my most favorite player and also my role model in football. I think maybe this could be his last world cup due to his age and that's why he giving out all of his best for his country Portugal to progress farther in this competition. You're right Cristiano Ronaldo haven't won the world cup for his home country before,though he has been working hard to see it happens but it' not going to easy anyway .Even though winning the world cup for Portugal before retiring from football would be his greatest joy but Believe me,this isn't going to be an easy tasks for him because he is not the only talented player in the world that wants to win the world cup. However Portugal performance in this world Cup Qua is overwhelming,it will be interesting seeing Portugal playing against Spain or Argentina next year.
That is life for you. You cannot have everything that you desire or work for. Ronaldo is a football legend. He has been creating new records for himself as he breaks old records but he hasn't been able to win the world cup which is the highest competition in football worldwide. I believe that he should have realized by now that, he wouldn't be able to achieve this goal.