How can I lose weight over summer?

I am 5'6,150 lbs,female and 14 years old and want to lose weight over the 3 months of summer. I want to be around 115-125 lbs by the end of summer. I have a membership to the gym but dont always go. I need to know what machines to go on and how long to go on them and the best time of day to do so. I also have a... show more I am 5'6,150 lbs,female and 14 years old and want to lose weight over the 3 months of summer. I want to be around 115-125 lbs by the end of summer. I have a membership to the gym but dont always go. I need to know what machines to go on and how long to go on them and the best time of day to do so. I also have a pool and like to swim. I can go long periods of time without eating so eating minimal is what i do best. I just need a plan for food and when to exercise. I want to see results. I have 3 months and im determined to push myself to get my dream body. Whats the best way to get these results?
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