I had a search referral from someone searching on Google for “he always wanted to say things, but no one listened.”
It’s the dog-gone poem again!
So I searched for it myself and it turns out this poem is an urban legend of sorts. There is no real story behind it! Everyone has a different version of who wrote it and where it was written and when it was written. Most of them revolve around a high schooler who commited suicide afterwords. But one page I came across had listed all the theories on it.
http://www.qis.net/~jschmitz/afu/yellow.htm
Crazy!