In life , not everyone smiling is really happy! some are rich and yet have no peace, some have a good spouse but no money, some have money but no education. What really makes you to worry?
People worry because they care too much. Too much worrying may lead to some serious mental condition which will affect our social relationship. If people will only let go of what will happen, less will worry and be sad. Sometimes, it's good to just go with the flow and raise everything to the Lord as He knows what's best for us.