Katniss censors her behavior at the reaping in front of the cameras, because she realizes that all of the capitol and every district will be watching this moment. She must not appear fragile, weak, or overly emotional because to do so could make her an easy target in the arena. Much of the preparation of the Hunger Games is about cultivating the image of the tribute, and Katniss is wise enough to realize that it begins from the moment that the tribute has been chosen. During her goodbyes, she reminds herself that "crying is not an option" because there will be more cameras at the train station (34). She must maintain a carefully crafted facade of strength in order to improve her chances at the Games.
She has to change her behavior in front of the cameras because if she appears fragile or weak she cannot set an example and she must mask her uncomfort. She also has to make sure the public likes her because the more the public likes her, the more ways it is possible to get a sponsor and to get a sponsor it means greater chances of living.
she has to become more likeable to the public so she can get sponsers