Hey Maddie -

Great job on the first 15 lbs!
Gosh, you sound a lot like me - heavy since middle school, around the same age as when I started...and the good news is, you can TOTALLY do this.
What eating plan are you using? We most likely have a forum for it if it's a healthy, sane plan, so look around. We also have the 20-somethings, for those in that age range, and the 300+ club and 100 lb club, for those starting at weights over 300 lbs, and those working on losing or who have lost 100 lbs or more, respectively.
So look around, settle in, and get to posting. Can't wait to get to know you better!