I'm Getting Frustrated

Okay, so today is my ninth day on 30DS, I think I notice some results because my clothes look better and from the side I look slimmer and so do my arms...but from the front my stomach is not as toned as I expected it (my BMI is at 'Normal') I weigh 128 pounds and I'm 5'4... I feel slightly discouraged and it doesn't help my siblings are the type that can eat a whole bag of chips and not gain a pound and I gain weight just by looking at junk food. i trust by the end of the 30 days I'll look better, but I'm nervous that I won't even though I'm sweating after each workout. :brokenheart: