I fractured my pelvis when i was 16 which left numbness, tngling, and hypersensitivity resulting in pain from light touch. what is causing this?

Pain: You might seriously consider seeing a neurologist for testing to determine if this is nerve pain or an orthopedic surgeon to evaluate if the fracture is properly healed.

Nerve injury: The symptoms you describe are called allodynia which means that normally non painful stimuli become painful. It is always from nerve disease or injury. Since the onset of symptoms is soon after fracture you have injured a nerve which is not likely to heal. Medications can control your symptoms.