If you have a fever of 104 it's time to get something done about it. you can soak your body in cold water in a bathtub or use ice bags to cool yourself down if you feel that's a problem see your doctor I'm sure your parents could help you
The average temperature of a 13 year old is the same as that of an adult. The temperature range is 36.5 degrees Celsius to 37.2 degrees Celsius. A temperature below or within this range is considered abnormal.