What is wrong with my neck? Platysmal bands? (Photo)

Yes, your presence of Significant (Platysmal) Banding is what is bothering you– this requires bringing the muscles together in the upper/mid neck to a more youthful position and occasionally their release. This procedure is called a platysmaplasty or platysma plication. Mild banding can be treated non- surgically with Botox or Dysport but this requires injections 3-4 times a year for maintenance

They are the vertical platysma bands that are visible because you are skinny at your neck and maybe due also to the early aging. They have correction with a properly done neck lift in experienced hands, a muscular lift, but I deem it is too soon for you for such major procedure. Give it a think.