Pain on right femur. I'm in my, same!

Hi I am Isaac, 20 yrs. I have been facing pain on right femur for several years. It pains seldom, approximately during Autumn season (November & December) and Spring (March & April), however except these months it does not disturb at all. I met different doctors however they found that there is no issues with bones based on X-ray results. It pains like a teeth pain (my heart beating on my femur). Eventually, I went to neurologist, she found out that right femur is not developing well compare to left one, she got that my right leg is 2 cm smaller & tin than left. She advised me to start training sports, but I have been training with wrestling since my childhood. Interestingly, if the pain starts, the next day I will go for jogging and it won't disturb for next season. For example, the pain starts 7 November, and it do not disturb till March & April. I was thinking the cold weather causes the pain because in my country Uzbekistan, in these months the weather changes, now i'm in MY, same