You should not worry. If there is no past history of any disease or injury to hip joint and you are
asymptomatic, this is absolutely normal. Right lower limb is slightly longer than the left one in all the
human beings, but the difference is so minute that it is practically not noticeable. But in some individuals
the difference can be large enough to become noticeable. Would suggest you to get your self a customized pair
of footwear with the heel size of the left leg matching up with the excess length of the right leg. Also
consult an orthopedic surgeon to get your hip and the knee joints examined to rule out any joint pathology.
Hope this helps.