How can I narrow down my too wide hip bones? (Photo)

Dear haileyrector,
it is hard to tell for sure without an examination. Generally speaking, liposuction is a great option for body contouring. If you are considering a surgery, I would suggest you to consult a board-certified plastic surgeon. Only after a thorough examination you will get more information and recommendations.
Daniel Barrett, MD
Certified, American Board of Plastic Surgery
Member, American Society of Plastic Surgery
Member, American Society of Aesthetic Plastic Surgery

While a portion of the outer iliac crest can be removed, the question is whether that would produce enough reduction to justify the effort. To qualify that answer better pictures of your actual hips would be needed with some imaging done. 

You can’t really have your bone structure changed. It’s possible to manipulate your fat distribution which can help create better contours with the use of liposuction and fat transfer such as the BBL procedure.For people with skin laxity, loose skin may also contribute significantly to contour.I suggest having multiple in person consultations with local board-certified plastic surgeons who have extensive experience with the BBL procedure in your area. Alternatively you can re-post with proper pictures so we can help make an assessment and give some recommendations.Please don’t wear clothing other than undergarments when posting pictures. Have someone else take the picture or use the timer on your camera. Pictures should be taken from about 8 feet of you standing in a neutral stance forward,  side and backside.Best, Mats Hagstrom, MD