WHY WORRY FOR THE BEST?

Why would other people instill "worries" about everything in the future when God can provide the BEST than what we ever wanted and needed? Like they hurried their children to earn a living as soon as they graduated, pushed to get married to give them grand-children or their friends before they get too old or before pregnancy will become high risk, to settle for less thinking before everything will run out. Why would they think that a child SHOULD BE born to be RESPONSIBLE for their parent's old age? Why is there such thing that a child owe their life to their parents when it was never their choice to be born in this world in the first place? Why would they blame anyone to the point of making others feel guilty for something that has been fell short for a long time or by nature? 

Why can't they understand that we cant own weightily in this world? They don't own their son and daughters, we don't own the mother nature and even we bought our favorite brand we still cant have them our whole life. Everything comes will be lost one day, we hoard it or not. Even you get married thinking to have someone by your side when you get old, no guarantee that you die together at the same time. Maybe you will die at early 50s or 60s or after 20years of being married. Who knows that our ignorance has already defied the highest sovereign thinking we know what we want but yet we will probably get more than we ever wanted and needed when we give all our trust to him and be patient for his perfect time because actually not all the time our parents know best as we always thought. Someday we would get to realize that the real happiness comes only just before our last breath because we have so much to thank God for all the best times of our lives when we were still healthy and very alive. So why worry?