Im 2 weeks postpartum and i felt fine no pain. all of a sudden i feel a burning pain coming from inside my cut csection . is this normal?

Pain not normal.: What you describe is not normal. I would expect the discomfort to decrease with time, not increase nor be associated with burning sensation. Normal healing will cause some of the nerve endings transected during the cesarean to produce neuropathic pain, but it should be mild. If your pain is moderate-severe you should see your obstetrician for evaluation.