what is a healthy waist size for a male?

alright so earlier today i was looking at my stomach and while all of my friends insist that i am not fat, i still LOOK fat when i look at myself. My doctor measured me roughly 7 months ago to be 6'7" though im probably more of a 6'8" now, i am 16 years old, and i weigh 153 pounds roughly. Plus my waist size is a 32 and ive been told numerous times that it is incredibly skinny for someone of my height yet i still look fat. So what would be a healthy weight and waist size for me at 6'8"?