I don't play any sports im having a pain that starts by my ankle bone up the side of my leg into my knee, i have difficulty walking what could it be?

Nerve/tendon: It sounds like a nerve or tendon problem. Shooting pains more from a nerve. It definitely needs further evaluation from a podiatrist.

Many possibilities: Your pain could be as a result of many different things. A thorough history and physical exam and possibly some laboratory and radiology exams are needed to determine the exact cause. Causes of pain may include: trauma (fracture, sprain, arthritis), infection, metabolic conditions (gout), musculoskeletal or biomechanical abnormality and neurologic conditions (neuropathy).

Muscle strain: This may have to due with an alignment issue. The pain could very well be due to muscle strain due to an alignment issue such as bowing/torsion on the tibia or knee bone. Some sort of brace or inserts are used to treat such conditions.