losing weight can be difficult, but with the right amount of exercise and having a healthy can help. to lose weight, you have do to hard tasks.
1) eat healthier foods. junk food taste good, but its bad for you. i suggest instead of having junk food, eat tasty fruits, such as apples, oranges, kiwi, etc. just make sure its healthy. also, no soda or other bad drinks, drinking water is great to help lose weight. i don't recommend even having gatorade, its all about having water and drinks lots of it.
2) get out in exercise. this is probably the hardest part because you need the motivation to get out to your weight room, or outside and run. doing sit-up and other ab exercises are great too. eating healthy is good and all, but exercising is very important. its good that you like to play DDR, and that's a better substitute than other video games, but its also good to run and lift weights. ik for this one kid at my school who was trying to lose weight, it was hard to come to the weight room for him and the track because he thought he would just embarrass himself, but he came over his fear of going to the places, and then started going, and now he's in pretty good shape.
well, i hope my post helped, even if it was just a little. getting the motivation to lose weight may be different from time to time, but just keep at it, and it will take some time, but it will be worth it in the end.