A thesis is the main idea of what you are about to talk about.
It helps the reader better prepare them self before actually reading it. You want to make is a very general statement about the rest of your paper, and not make it very intricate or advanced. BRAINSTORM!!! its okay if you dont get it right on the first go! always test to see what maks sence! hope this helps you!
As with any author's decision to use 1st person, her intention most likely -- in this story -- was to get her readers to go along for the ride into madness and cultivate a certain amount of sympathy for the narrator and her plight. The constant use of "I" puts readers in the narrator’s head and allows them to empathize with her.
They are scared!!!!!!!!!!!