Its to evoke a specific emotional state in the reader.
When he says he is alone, he means that he is abandoned by God. He is in a concentration camp, where he is forced to witness death almost every day, and he cannot do anything about it. However, nobody even tries to do anything - there is no sense of solidarity and fighting for freedom; there is no friendship in the camp; there is no sense of community, so even though he is surrounded by many people, he is ultimately alone given that he doesn't care about them and in turn they don't care about him. Also, he believes God has 'left the Earth' given that he doesn't even try to help his creations.
You need to provide the story or at least the title of it
Answer:
Start your story with the premise of him being a alone but build his character up.
Explanation: Are you going for a first person autobiography of a 16 year old teen with his siblings making their way in the world? That sounds cool but honestly you kinda have the story set already to me. A bunch of siblings trying to survive by themselves. The big brother is trying to keep up with taking care of his siblings. It sounds like a great story!
The front page of a newspaper, would most likely be the best, because so many people read newspapers these days. Its highly likely, many people will be able to see your ad first thing.
