You have a deficiency in both the mentalis and the body of the mandible.
Both the chin and the main mandible are both lacking in sufficient size in comparison to the Maxilla.
A chin, implant or sliding genioplasty, will only address the tip of the mandible or the mentalis or chin region.
If you...
You have a retruded chin and this is making your labiomental fold deep. You need to see a Maxillofacial surgeon who understands jaw relationships and who undertakes cosmetic facial plastic surgery. If you are planning to have any orthodontic treatment, this may include the need for jaw...
Based on the photos that you provided, I would recommend a chin advancement procedure to improve your lower facial balance. Either a genioplasty or chin implant is advisable.