Answer:
his personal struggle with how to handle Mitchell.
Step-by-step explanation:
A character vs Self-conflict is a type of struggle a character experiences within himself. The character in this instance struggles with self-doubt, his inability to achieve something, or an issue of morality. Paul in this excerpt experiences this kind of conflict because he is unhappy due to his inability to handle Mitchell.
This represents his personal struggle which upsets him. We are able to know about this self-conflict that Paul experiences through his conversation with Cassie.