Am i on the right track to losing 20lbs in a month or 2?

Uh you really shouldn't be trying to lose any weight. At 120 lbs and a height of 5'6" your BMI is 19.4 which is in the normal weight category. If you go down to 100 lbs, your BMI will be 16.5, which will put you way underweight. Being underweight can be unhealthy just like being overweight can. Just tell those people who've said you've gained some pounds to go f off. There's nothing wrong with your weight; you sound pretty in shape to me.