Brenda Elzin

I saw this movie what seems like a long time ago, but I don't know how long. I don't remember it well at all, but I can remember little bits. There was a bus that sank in a river or lake. There was a character who had baseball cards taken away by the principal of the school. At the very end of the movie, the main character is grown up and looking at the grave of his friend that died. Any help?