I am having trouble eating my calorie limit

I've been exercising for a couple weeks now and its like my appetite has gotten worse. I have a limit of 1200 calories, I am totally sedentary unless I exercise, than eat my calories burned exercising. Or at least that is what I am supposed to be doing, but I can't seem to stop eating!! Anyone have this problem? I eat healthy and hearty meals, try to stay low calorie because I know me and I like to snack between meals. I calculated I eat half my daily calories just on snacks! I keep trying to adjust or change it, but I cant seem to do it. HELP!