The outsiders

I read a book " THE OUTSIDERS", I like it so much, and i thounght that I understood it, but when I was doing a paper that the teacher gave to us, I realise that I didn't know what the book want to show me...

The book is about a guy, Ponyboy, he is a greaser and there are a lot of fights between the greasers (poor people) and the socs (rich people, a lot of his friends are very bad because of that fights and then one night , Johnny kill someone , because that person were going to kill Ponyboy.
They have to go to a deserted church, they stay there during a lot of time, and one day a friend take them to their houses, but johnny die saving some children and he become an heroe.
After die, Johnny write a letter to Ponyboy saying:
Ponyboy you have to show to the children that there are still good things to fight for and people can't judge a person because of how they look...

And I don't know what the book want to say to me, ....maybe it want to say to me that, I can't judge a person because of their look, or maybe that there are good things in life to fight for...or maybe the differences between two societies....

I really don't know, maybe I should read the book again and I think maybe the second time I would understand it better ....But I really want to understan it....really...

Maria my english teacher told that she thinks it is about you are not younger forever...but I DON'T KNOW MAYBE IT IS...