You don't need cardio per se to lose weight along with a good diet. Simply moving about on foot without the intent of making it cardio can make a huge difference and a big cut in fat pecentage. Walk to school/work, walk to the store, to practice, to friends, walk in general. Its refreshing and gives you time to take in the world around you and think and appreciate. If you don't consider your physical activity cardio, it will be easier on a psychological level to motivate yourself to go out and simply move a little. I could never understand this mentality though since I love working out myself (I'm a powerlifter and personal trainer so this is a big part of my life) but hang in there and get out and about! 
Start by just walking a lot and cutting your food intake. Don't cut it too much, about 2-300 calories under your maintenance level is just about right, cut more and your body goes into saving mode, shedding water and muscle tissue and conserving fat, making future fat loss all the more difficult.
Most importantly; stick to it!
