FadedMaster is right. You need to lose the weight for the right reasons. For example, don't tell yourself you want to lose weight so you can look as good as your sister, do it because you want to be healthy and happy and beautiful. Doing it for the right reasons will be a lot easier. You won't get overnight results, it will take time and the stronger your reason for the change the easier it will be to stick with it.
First, consult your doctor, maybe even a nutritionist. Eating healthy is your number one priority. Skipping meals is NOT eating healthy, it does more harm to your body than good. Here is a link to a great diet plan http://www.the-zone-diet-plan.com/
Your second priority, Exercise! Try and train at least 5 days a week, 1 hour a day. Cardio every day, whether its running, cycling, dancing, whatever you like, but try and do something different every day. Have you heard of 'Zumba' I hear it's really good for losing weight and apparently its fun too lol. Working your abs as well as plenty of cardio will get you a nice toned stomach, and working your legs with squats, lunges and so on will get you those nice long, slim legs that I assume you would want.
One more thing. Don't over do it! If your body isn't used to intense training, pushing yourself too hard won't do you any good. Work up to it, get yourself into a good routine and then you can really start to turn your life around.
The most important thing is to feel good about yourself. Be happy and stay positive. Good Luck.
If you need more details, so do we. Height? Weight? Fitness level? If you want I can even help you write up a training program.
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