How can sunken nasal bone be fixed? (Photo)

Hello doctor, I'm 20 years old. Recently, I started to feel pressure at my nasal bone (between forehead and cartilage). I noticed that, actually, my nasal bone is sunken while the catilage is still straight. When I was 10, I felt and hit a lecture hall dais right at the nasal bone. However, I didn't pay attention after that time. I'm so afraid that it can not be fixed because maybe it took a long time. Or is it natural? Could you possibly tell me can I fix my nose bridge and how? Thanks!!!