I think there are two ptions that show internal conflict:
1) He considers whether or not to trust the inmate who tells him he´s not fifteen.
In this case he doesn't know the inmmate and doesn't know the exact reason hes telling him to lie. One reason is because he wants to help him, that information would save his life from the SS. The other option is that the inmmate is selfish and by telling him to lie, the kid will be punished instead of him. The kid must decide then if he trusts him or not.
2) He must decide whether or not to tell Dr. Mengele the truth about his age.
In this case he has even more doubts, he knows Mengeles reputation and he doesn't know how much information does he have and how will it affect him. If he lies he might know it and punish him or that lie could save him.
The conflict is real because his life could depend on the decissions he makes.
What a person does is far more important than what a person thinks. Like I'm sure you've heard before "actions speak louder than words." For example, let's say someone thinks up a new cure for cancer , or a cure for blindness and deafness. It doesn't change anything or mean anything until the person makes it a reality. Until the person actually cures someone, their thoughts are meaningless.
What are you talking about? (what does the 1st question mean?)
self deprecating modest about or critical of oneself, especially humorously so