Jennifer -
One of the talking points that my program stresses at the outset is that obesity is a disease. It's not an effect of laziness. Especially if you are at the point of seeking surgery to help, it's clear that you have tried everything you can and are serious about losing the weight and being healthier. Whether it is genetic or not, obesity is not something that the average person can just "get over." My obesity is genetic, but I had kept it under control for a long time until my late 20s. Then some life circumstances got in the way and made it very difficult to manage. I knew that I needed a tool to help me regain control of it. I look at my band as a tool to manage my disease in the same way as diabetics have tools to change their eating and lifestyle to manage theirs.
I come from a family with a long history of struggling with weight and while they are supportive, they worry that it's just one more fad like all of the ones they've tried. I know this isn't the case, and the research and success results prove that. We have the medical technology now to have minimally invasive surgery to put a tool in place to help us manage our obesity. Why on earth should we not do so? I don't want to be one of the fat american statistics, and I don't have to. Neither do you.
I was heavier than you when I had my initial consultation, but also taller, and I also didn't have any diabetes or the other things. I still qualified for the surgery based on it being a preventative measure. I would be suprised if, at your height and weight, you didn't also qualify. Take heart, and be strong in your decision. This has nothing to do with your family. This is about you and what you want and need. You have obviously taken years to think about this and research it. Give yourself the credit of knowing what is right for you.
Good Luck!