Im 18 too and im getting my band in Dec. too...at first my dad was so against it, he also said that I havent even tried to loose the weight on my own but I gave him my reasons and though he still feels like I shouldnt get it, I know he knows my reasons and that all I need. Once you start loosing weight, they will see and change in you and then they will understand. I hope everything gets better for you. Just be honest