When you're going insane

You don't know your going insane, you think you're just fine

But your, nonetheless, surely, positively going insane

Because of the damn letters he left, And the unsatisfying goodbye

 But you kept walked in the dull, green grass, with your insane brain, and the last letter in your right hand. 

You had a shell in the other hand, and held it up to your ear and said, "won't you listen? Just listen, it's wonderful. Better than here." 

It wasn't real, no one was there, you were standing by no one, in vast nothingness. 

You realized, your, nonetheless, surely, positively, insane.