Protagonist? Protagonist!

After the first four chapters I have finally figured out who the protagonist - or central character - is in The Sun Also Rises. Jake Barnes, the narrator, reveals many different characters throughout the beginning chapters; however, he is the main character himself. The first two chapters describe Robert Cohn, but then drift away to reveal Jake's characteristics and point of view. Speaking of point of view, the novel is written in first person POV. Jake is not only the protagonist, but the narrator. As the audience, we see and hear everything only from his perspective. Although first person POV is easier to follow while reading, it sometimes becomes boring when only reading one opinion over and over.