What is a man vs. self conflict for Katniss in the Catching Fire novel?
Katniss experiences a number of life-altering changes after winning The Hunger Games, as well as trauma from the Games themselves. It is unsurprising that she would have many internal conflicts as a result.
One of these conflicts involves her contradictory feelings about her new place in District 12. In the first book, she was among the poorest of the poor in her District, nearly dying of hunger when her father died in a mining accident. In Catching Fire, she has become one of the most wealthy people in the District, living in the Victor's Village with her mother and sister and enjoying plenty of food, warmth, etc. Despite having her basic needs amply met for the first time, Katniss is clearly uncomfortable with the arrangement. She is isolated physically from the rest of District 12, but also emotionally as the daily struggle for survival is something most of her fellow citizens still experience. This discomfort is shown when she returns to her old house, longing for a simpler, though more difficult, past.
Another internal conflict that Katniss struggles with during the novel is her survivor's guilt. This is particularly evidence during the tour of the Districts. Looking into the faces of family members and remembering the children who were killed has a strong effect on her, especially when she visits Rue's District. Though she is, of course, thankful to have won and survived, she feels enormous guilt over many of those who died, particularly Rue.