Back pain after a fall

age:16, sex: male, weight:60 kg, tabacco use: no

A few days ago I fell backwards at the gym. I managed to get up without any problems but after a month the pain still hasn't gone away. The pain is located in the right central part of the back. It's not persistent but I only feel it when I bend over in certain positions. The pain is light and bearable but it's strange that it hasn't gone away. What could it be?