1. Juli Baker vs. Bryce Loski (External Conflict): This is the central conflict of the book. Juli has a crush on Bryce, but Bryce is initially repelled by her and her family, particularly her eccentric father. This conflict plays out in various ways, from Bryce's attempts to avoid Juli to Juli's efforts to win him over. The conflict escalates and culminates in a confrontation where Bryce finally recognizes Juli's good qualities.
2. Bryce Loski vs. His Own Prejudice (Internal Conflict): Bryce is conflicted about his feelings towards Juli. He's initially swayed by his friends' negative opinions and his own sense of societal pressure. He sees Juli as "different" and struggles to overcome these preconceived notions. This internal conflict eventually leads him to question his own biases and ultimately realize his true feelings for Juli.
3. Juli Baker vs. Her Father's Behavior (External Conflict): Juli's father is a somewhat eccentric character, and his unconventional ways sometimes embarrass Juli. This creates tension between them and makes it harder for Juli to relate to him and feel comfortable with her family life. The conflict culminates in a confrontation where Juli defends her father and expresses her love for him despite his imperfections.