Will Wearing a Retainer Move my Jaw? (photo)

Retainers should not have any effect on your jaw position....if yours does then it is really not a "retainer" but a "functional appliance".  In any case it will not have any effect on your jaw structure as you are no longer growing.  From the looks of your picture you certainly would benefit from some type of surgery.  If your teeth and bite are good then a chin implant might help, otherwise I'm afraid you would need to get retreated in braces followed by jaw surgery

The purpose of a retainer is simply to hold things in place, not move them.  While your retainer (more likely a functional appliance) may seem to have this effect, its effects are likely minor and not permanent.

The only real way to treat you would be braces again combined with surgery.  If all other things are fine, a chin implant can be an option.