First of all you don't have a 28inch waist, but i would agree you have average genetics, secondly ecto genetics are perfect for bodybuilding, less work to create the illsuion.
And lastly Nutrient manipulation means fuck all to anybody. Bodybuilding is training, rest, food. The outcome is dependant upon genetics and to move past a certain plateau drugs are a prerequisite.
OK, I will measure my waist for you and take a pic, it's 28 inches bro.
Secondly, the PRECISE macronutrients that you eat, and how much of them, will largely determine your gains in muscle mass and/or fat reduction. If you want to get to the next level, join me, i'll take you there