I've had a few exercise issues through my SW career (and still have!)...but ultimately, it's good for you!
It tones you up, which makes you lose inches, if not weight. It makes you fitter, which in turn helps increase the rate at which you burn calories (your metabolic rate)...which will make you burn fat more quickly. You'll feel the benefits of being fitter all the time - popping upstairs, running for a bus, carrying shopping, generally feeling better and less tired. You'll sleep better at night...shall I go on?!
Exercise is ace!
Keep it up, make sure you drink plenty of water all the time - being hydrated is important. If you're doing loads of cardio you'll need carbs for fuel...but if you want to feed your muscle it's a good idea to eat lean protein after exercising. For fat-burning, you want to be doing moderate exercise. So that's something that raises your heart rate and makes you break a gentle sweat and feel slightly breathless. Once you get into heart pounding/sweat pouring/can't speak territory, you're doing cardio, which is still good for your fitness but does different things for you body-wise.
I'm not an expert...there are many on here more knowledgeable than moi. But I have had my exercise issues, as I said, so I've done some reading up about it all.
I'm not saying you need to be fit like Kelly Holmes!!! Good grief, I'm Miss Lazy really! But it really will help you get the figure you want, in the long term.