Hi Stephanie and welcome to the Jaded Ladies!
I'm no expert, but I know it's really hard to lose weight by exercise alone. I have had a lot of success with Weight Watchers (although I seem to be at a plateau right now!) and would recommend it to you.
I have some friends who have lost with South Beach, and I know it is referred to as the "Healthy Atkins". Basically, though, you have to eat less than you need to survive, hence the loss. A pound is made up of 3500 calories, or 500 a day. If you normally eat 2000 calories, and you cut it back to 1500, you'd lose a pound a week. Forgive me if you already know this... anyway, I think you should keep track of your calories, keep exercising, and drink lots of water.
You don't mention your age or anything, but if you are a teen, make sure you get enough calcium. (Actually, that's good advice for any of us.) Try to pick foods that are good for you - fruits, veggies, lean meats.... you know the drill. Hop in at the Jaded Ladies chit chat if you'd like... we welcome you there!
85 pounds lost with Vertical Sleeve Gastrectomy
110 pounds lost from highest weight