Because its referring to you. And when you refer to someone or yourself you capitalize. Its also part of a proper noun.
Sitting before the blank diary page, Winston is about to commit a crime.
It is not surprising that at this moment, his sore begins to itch unbearably. It is a reminder of his guilty conscience and of the crime he is about to commit. It is his internalization of Big Brother, reminding him that any thought not in support of Big Brother is a crime.
Answer:
questions 8 is a dialogue
