Why is my neck like this and is there a procedure to fix it? (Photo)

You have less definition of the neck angle than you're likely wishing.  There are good surgical and non-surgical treatments for this, and you need to find out your options by having a proper examination with a qualified plastic surgeon.   Be sure to discuss with your own surgeon about how this applies to you, and whether they have any special concerns in your case.

  Fatty deposit removal in the neck can give a better jawline,  and it is important to have  an in-person examination and consultation to determine the extent of fatty deposits above AND below the platysma muscle.  Liposuction can remove the fatty deposits above the muscle, however surgery is required to remove the fatty deposits below the muscle. If any fat is removed from below the muscle, a platysma plasty is also required. For many examples, please see the link and video below

Thank you for the question. Others have suggested that this is fat excess. If so, Kybella or liposuction would be great options. However, since you say that this has always been your neck shape, please consider that this may be  related to the anatomy of your neck structures. In some patients, the voice box is very anterior -- this leads to a more obtuse neck angle and limits the efficacy of treatments like facelift, neck lift, liposuction, etc. You need to have an in-person examination with a board certified specialist to determine candidacy for procedures. Best of luck moving forward!