Lyric discussion by DudeWithBeard 

Cover art for Paint Box lyrics by Pink Floyd

If you have ever read The Catcher in the Rye, this song describes EXACTLY how Holden Caulfield feels. He gets drunk, feels empty, hates all the "phonies". Goes to a show with Sally, he disappoints her somehow or other, and doesn't really have fun. Basically he just feels empty whenever he interacts with people.