As a 16 year old, you're probably experiencing heart murmuring, fluttering or heart burn. The first two are pretty common and don't indicate any disease or disorder by themselves (but they cause momentary discomfort and a little pain for a few seconds or a minute or two) The third thing is caused by acid build-up in your stomach and it may feel like your chest is on fire for a certain period of time. You may have also just pulled a muscle in your chest, if you're an athlete of some kind.
I cant really gove you an answer,but what I can give you is a way to a solution, that is you have to find the anglde that you relate to or peaks your interest. A good paper is one that people get drawn into because it reaches them ln some way.As for me WW11 to me, I think of the holocaust and the effect it had on the survivors, their families and those who stood by and did nothing until it was too late.