You mentioned that you have a large amount of meals, but also do not love sports, it will certainly be very easy to get fat. If you do exercise, I suggest you go out and exercise, for example, you can go to the playground to run a few laps every night, and go to the park or the stadium if you don't live in the school. Running is really effective, to give an example of my high school classmates, high school when he was very fat, high school sophomore and junior he did not eat every night, go to the playground to run two or three laps to the high school, really thin a lot of people, but also looked very strong, is the body is quite good. This month to reduce down, a little less realistic, or to adhere to ah, can not three-minute fever, must adhere to down. Like you say indoor sports, that generally speaking is push-ups, sit-ups, these are still on the role of fitness, weight loss should not be too obvious. You can download keep those fitness software, quite good.
One more thing is to eat less. Also an example, for example, I do not eat dinner breakfast a month to lose 4, 5 pounds, of course, breakfast or to eat, otherwise the stomach is not good, so you have to abstain from food, really want to lose weight if you want to eat less at night, with fruit instead of meat.
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Go for it friend, losing weight really isn't a two or three day thing, you're sticking with it and you're sure to be able to lose weight.