When Ender is asked to leave his family, what is Ender’s internal conflict?

I think that Ender is initially scared. After considering everything, Ender says, "I'm afraid. But I'll go with you." He says goodbye to his parents and Valentine--even Peter, who shakes his hand and says, "You lucky little pinheaded fart-eater." Valentine's last, anguished words are, "Come back to me! I love you forever!"