Exercsing and dieting for 6 years but no RESULTS!?

right for 6 years i have been exercising and dieting ,ive tryed weight loss pills ,i have tryed everything maple syrup diet also, but i am gaining weight i drink plenty of water no junk or fat food ,no bread ,i dont starve myself i munch on veg and fruits ! i am doing the right thing ive seen the doctors but they say its natural and also that its not medical am 17 and really wanna loose weight by 21 !