Do I have to refund my ticket if I don't take the high-speed train? I don't want to travel far, so I can't play. My parents bought the tickets and they won't let me return them.

First of all, you don't have to refund the ticket. If you don't feel bad about money, you don't have to return it or take the car. Then, if you don't take the train according to the number and time marked on the high-speed rail ticket, you are not allowed to refund the ticket, but you can change other trains before 0: 00 on the same day within two hours after the train leaves. If you don't change your ticket in time within two hours, the ticket will be invalid!