I can understand that you have this pain since a long time. Treatment for genu valgum depends on the severity of deformity at the knees and the extent of discomfort it causes (eg. difficulty in walking, pain in the knees). Genu valgum can be treated with minor surgery during the growth phase (usually upto 16 years of age). After growth stops(seen as fusion of growth plates) , in most cases after 16 years of age, usually an osteotomy is required to correct high degrees of deformity. This is done after ascertaining whether the thigh bone or leg bone is involved.