looks like you may have a mild form of scoliosis. I have this and i've just had an operation couple weeks ago to straighten my spine. I had a 90c curve so mine was quite bad but now after the operation it's much better. I suggest you go to the doctors who will refer to you the spinal department of a hospital. As your curve looks quite small, you may just have to wear a back brace for period of time which can help straighten it without the need of an operation. However, yours really doesn't look bad at all so if it's not causing you any pain, I wouldn't worry about it!