I know how hard it is to get into the habit of something good, the bad ones seem to come pretty easy. I am probably one of the laziest people in the world, I was one of those people that would huff and puff about having to go get something from the car, and spend more time searching for the remote than it took to get up and turn the channel by hand. Sometimes it takes something to click, and sometimes you have to make that click happen yourself. I did the later. I was tired of feeling unhealthy, wanted to lose some weight but didn't have the knowledge. So i came here, looking for answers and advice and got them. The knowledge is the most important part, once you have that the will becomes easier.
So here is some knowledge and hopefully we can help you apply it.
In a day with your activity your body (with the stats you gave) burns between 2500-2700 calories a day. What you want to do to lose weight is to create a calorie deficit of 500 calories. Meaning you should take in 2000-2200 calories a day to lose weight. Doing any less than that will make you store fat due to starvation, so you want to try to keep it in that range for best results and to not lose muscle tissue.
You want to eat 5-6 meals a day, with each meal having close to or equal amount of calories. Try and do what you can with the food you are provided and see if you can get your parents to buy you a few things. You want to eat 1 carb and 1 protein for each meal. Good carbs are whole grains, veggies, fruits. Protein should be lean meats like chicken, turkey, egg whites or protein shakes. also throwing in some non-fat cottage cheese and yogurt is a good source. Drink plenty of water, cut out soft drinks and all that. Basically you know whats bad and if you don't well then just ask, trust me we will be quick to tell you.
You want to get in 4-5 days of cardio and 3 full body strength training days in for working out in the beginning. Training is important because muscle burns fat faster. Try and do both HIIT cardio and Low intensity cardio. HIIT is explained in a whole forum section on this board. Low intensity is basically staying at your target heart rate for an extended amount of time (25 to 40 mins). I do both in my routine and have seen great results.
Now of course this is a basic guideline but read around this boards, read the weight loss FAQ, and get the info. Make a list of why this is important to you, weither it be a girl, the desire for one, health, whatever. Give yourself a prize to reach. Also when your working out put on a movie or good music, distract yourself at first. Starting out you don't have to be so focused and serious sometimes, allow yourself to make mistakes, just keep doing it, make it a habit, that is the most important thing. Then once it does, make the diet even cleaner, get even more focused, ween yourself into a lifestyle change because thats what it is. Its not a diet, its a new life.