Tibia fracture. Right treatment for me.

I had a fracture in both tibia and fibula around 7 weeks ago. I did surgery within 24 hours since the fracture and a rod was inserted in my tibia. Doctor advised me that I can bear full weight after 3 months. I didn't feel any pain at the fracture area. However, I am unable to stretch and bend my knee. I feel intense pain at my knee if I move leg. Almost 2 months passed, but I still can't even practice walking due to this paint at the knee. After looking at my x-ray, I feel that the rod inserted to my tibia is longer than my size(x-ray attached). I checked many x-rays at internet and in all those x-rays, the rod is shorter than the tibia but in my case rod is longer than tibia. You can see the rod around my knee. I believe this rod is blocking the movement of my leg. I would be glad if you could advise me the right treatment for me.