Sometimes we worry too much about the things that happen to us without thinking that other people may be worse off. There is a part of the population in the world that can not even drink some clean water.
There is a saying that says: Some are born in flowers and another in mud. We must be grateful that we are not in the mud.
It is one to thing to think about soemthing and be concerned about it and it is entirely different thing to be highly worried about something. Worrying isn't too bad as long as you realize what you are doing. If you are consciously worrying about something, you are quite likely to stop doing it when you realize it won't do you any good. However, unfortunately most of us practice unconscious worrying. Often, when we are fixated on the things going wrong in our life, we start thinking randomly and one thing leads to another which often makes us forget about the problem at hand and worry about other issues. This increases our stress and does us no good.