Sudden Back Pain

I am a 17 year old girl, and I have been suffering from back pain all my life. If something puts pressure (i.e by touching) on my back, particularly the area around the curve on my lower back, I get a sharp pain which is gone almost as soon as it starts. It is very inconvieniant and happens relatively frequently. I went to the doctors and was told that this could be caused by the curvature of my spine, which is suffering, I believe, from mild kyphosis, as the bottom of my spine curves further inwards than it should. This is also present in my mother, although she has never experienced any related pain. Any suggestions of diagnosis or treatment would be greatly appreciated.

Katie