Definitely what everyone said. I have been doing Just Dance songs too and I'm amazed by how many calories I'm estimated to have burned. I didn't feel all upset or beaten up after the workout and yet somehow I was still sweaty all over and breathing a lot. You totally can.
I would advise against using only food modifications to lose weight. I've done that (improving my nutrition) and it has helped lose weight... but I just look like a smaller version of my fat self! No no no, definitely exercise so you can look all toned instead of small-yet-flabby. Besides, if you're in America I can point out one very important thing that many of my foreign friends notice about coming to this country and once again upon leaving this country: Stress. more than the starch or sugar or fat or highly processed food or what have you, stress is such a bummer in this culture! It really has more of a profound effect than anyone seems to realize even with diets with comparable calorie content. And you know what helps with stress? Exercise. ESPECIALLY dancing.
I may do any old beachbody workout on my own, but when I wanna relieve a stressful week/month/year, I go out dancing with my girls and we sweat sweat sweat. So yes! Dance dance dance! And don't forget to drink water, and don't forget to get proper sleep. There's a lot to proper health but starting with a couple of basic steps and getting those nailed down may help you in the future rather than doing a complete overhaul and quitting all bad habits cold-turkey.