Re: i really need help
a good, cheap way to lose weight and get fit is taking up walking, progressing to jogging, then running. so for the first few weeks try a 30 minute walk (or as long as you want) everyday, then as your fitness improves try jogging half then walking half, for as long as you feel you can. the good thing about this is that its unlikely to get boring as you can vary your route, your speed and your length of time to give you some variety.
As far as eating goes, you should aim to gradually make small changes to your diet that will eventually add up to a complete change of lifestyle. for example, for the first few weeks try cutting out junk from your diet, then next increase the amount of water you drink, switch white bread for wholemeal, eat a healthy breakfast (eg. oatmeal, fruit, eggs) and snack on fruit and veggies.
hopefully this might work for you, i think its good that you're trying to make a positive change to your health at this age. its much easier to do this while you're young as your skin is more elastic and should shrink easily as you lose weight. plus, by making changes to your health and fitness at this age you'll be helping yourself to be a healthy adult, and maybe live longer. best of luck to you