my legs hurt really bad. please help?

well i have complained about my legs hurting since i was about 6 years old. Now im 19. i cant really explain the pain. It feels like its my bones aching. (hurts the worst up and down shins and around ankles although i cant pin point where exactly. Ive been to the doctor but they arent sure what it is. Its also tender to the touch. Heat makes it feel a bit better only for a few minutes….could it be fibromyalgia or ….???
im 5'4 and havent grown since i was 13