hey folks, i'm newly 17 years old, i've lost 45 pounds in the last year. i have about 10 pounds left . this is where i need some help. 17 years old 6'1'' i consume 2100 calories a day, i lift weights and do cardio exercise 4 times a week. but yet the last ten pounds is just simply not coming off, in the past 2 months i haven't seen any changes, all the weight left is located lower abdomen(and i do core exercises). i'm in good shape, ( i can run 3 1/4 miles in 20 minutes) where are the flaws, what's keeping me back from my ultimate weight loss goal( flat belly) any insight VERY appreciated.