Missk,
I noticed the first time you posted and I posted something to you that I'm not sure you saw...
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Missk,
Welcome to 3FC.
Have you checked our support forum?
http://www.3fatchicks.com/forum/forumdisplay.php?f=13
I was 300 lbs at the age of 18 so I understand how you can be overwhelmed by being an overweight teenager. It does take a lot of trial and error to figure out what will help you lose weight but exercise is only part of the equation. Calories and what you are eating are a much larger portion of the weight loss equation.
There are many people who in the support forum who have been where you are right now and can give you ideas on how to make sure your weight loss progresses.
There are many other forums on this site that can help you gain the support and knowledge that you need to help you lose weight. Again, welcome