Why do I have sharp hip pain?

Unclear. Not enough information, where exactly is the pain? when did it start?was there an injury? What are your normal activities? The range of causes for someone your age is broad so more information is needed to make a diagnosis.
Bursitis . It depends on the location of the pain. If it is on the side of the pelvis that may well be bursitis of the hip. This is often trochanteric bursitis More often the hip joint pain is felt in the groin. Your physician would be able to evaluate you and decide on the diagnosis. Therapy would include NSAIDS, physical therapy, injections, etc.