To be honest when I was 18 I weighed about the same as you do and I completely empathize that no matter what I did, I couldn't lose the weight. I got the surgery last year when I was 22. Part of me wishes I had done it when I was 18 before I had gained more weight, but I don't think I was quite ready for everything that comes with having this surgery when I got it. I am struggling with this change of lifestyle everyday, but I do have hope that this will work for me even though I haven't lost as much weight as I would like yet. So really think about if you are ready to go through the emotional aspects that this surgery brings much more than the physical aspects. I thought in the beginning that giving up foods that I love and throwing up every once in a while would be fine, but every once in a while I do get depressed. Don't let that discourage you though because a lot of people don't have these problems and feelings, but you should think about it in case you do. With that I hope you make the decision thats right for you. I am so glad that I got mine the happiness in seeing that scale go down and me feeling healthier have definately surpassed the bad emotional aspects. Good luck!