Wow, sounds like we have the same beginning, so let me introduce myself.
I'm Serenity, I'm 19 and from northern California. I have always been extremely active, and although I wasn't as small as you, at 16 years old I was a perfect 110 pounds. Unfortunately, I too was sexually/physically/mentally assaulted at that age, and the tolls have been enourmous. I went through, similar to you, many different forms of therapy, and many many medications to battle the post traumatic stress as well as the insomnia and anxiety. Although the depression, anxiety, and insomnia have pretty much gone away thanks to the medications and time, I managed to put on about 115 pounds in three years. Wow, right?! That's what I said. I was completely in denial of how much weight I had gained until I was diagnosed with sleep apnea. Because of my rapid weight gain I now stop breathing in my sleep. Not only is it horrible for my health, but it's definately not easy having friends over when I'm stuck wearing a cpap machine to bed.
Hence how I ended up looking into the lap band surgery. Throughout those three years I have tried every diet, every personal trainer or work out video i could get my hands on, and after losing the initial 10 pounds or so, I couldn't get anymore off. I, too, am feeling a little confused and afraid of the lifestyle changes I must commit to in order for this "tool" to be helpful, however, I feel that missing out on normal teenage activities is harder than those lifestyle changes. I would love to be able to snowboard again, or go to the waterpark without crying for hours and hours at a time. I would love to go play football in the rain, skip around the mall, or even go hiking again... and for me the lifestyle changes totally seem worth it to be able to do the things i love doing again.
Growing up in everything from beauty pageants, to dance classes, to an amazing 8 years cheerleading, I never thought I would be in the position I am now. I think gaining this weight has taught me alot about life, and people in general, but I also think it's time for me to take action and do what I need to do to be happy again.
I would love to talk to you if you think it would help.. I'm excited I found the teen forums because I really wasn't relating much to the 40's and 50's year olds..