It is hard. Try reading the Bible and praying. Look at nature and all the beauty. I also find that watching a good movie can take my mind off things for a couple of hours.
Just remember it can all end suddenly today. So live life honestly and find joy.
When I was your age (over fifty years ago) we use to practice Nuclear Warfare Drills (never heard of Vietnam) yet here we are ... Live life, worry only about the things you can do something about .... School, your friends, how you treat others, etc.
What, specifically, are you afraid will happen?
stop thinking about it would be a good start. think about positive things. you're too young to worry about things that probably won't happen in your lifetime anyway. :)
don't , that just means u care about the future of the earth and its creatures and that ur well connected with todays worries and hardships. als ur a smart person
Stop giving attention to the mainstream media. They want to control you with fear.
Go for a walk.