How to straighten bent leg?

first of all, im a girl n my left leg is abit bent like this [lets say this r my legs bellow knee. this one is bent >(| <this is normal]. my parents took me to the hospital n the doctors said theres nth rong, we went twice or thrice n the doctors repeated the same thing, i even got in the MRI. it actually hurts alot maybe probably the AC? my joints n bones r weak n hurt a lot, my bent leg is showing b4 it wasnt so now walkin, a person can say that i have bent leg n i dont want that...this is the 4th year having joint pains as 14year old n bent leg for 2,3 yrs i guess.... so my question is is there ANY way? to straighten it and by the way my left hip, knee and angle joints hurt n i feel like they moved from their places thats why my left leg is bent. will calcium work? i started taking calcium... any good answer will be appericiated.