The more overweight a person is, the easier and faster weight loss is. If there is only a little bit of weight to lose then it's harder and takes more time. My weights around where yours is right now too.
Are you only dieting? If you want to see a change faster you probably want to include daily exercise.
Good luck, don't get discouraged! Instead of only weighing yourself maybe get a tape measurer and get the measurements of your stomach, waist, hips, thighs, etc, then you can actually see how smaller everything is getting over time.