Help idk what to do?

ive run cross-contry long distance track for my homeroom teacher,teacher, and coach im top 5 on both teams and he really wants me to do cross-contry next year at the highschool but i kinda wana do fencing. he is like a mentor to me i have so much respect for him and i dont want to let him down and he keeps telling me all this stuff about how to b a better runner and how he sees alot of himself in me. but the coach in the highschool just tells us to go run he isnt a verry good coach and i know i will hate him unlike my old coach that runs with the team and is verry supportive yet still works us hard but he is awsome i really dont wana let him down what should i do?