Im 5ft 11 and 180lbs
Thats about right 
Its probably 20lbs more than you need though. Its butter.
You even pop into the overweight band on a modern day graph where your max should be 175 lbs.
Of course you are about average height. We only have to go back as far as 1960 before the real splurge in steroids and fast food to see that an average man of your height in 1960 was just 166lb.
Meanwhile, the average weight for men aged 20-74 years rose dramatically from 166.3 pounds in 1960 to 191 pounds in 2002, while the average weight for women the same age increased from 140.2 pounds in 1960 to 164.3 pounds in 2002.
You are also getting a warped view of what is normal.
The New Normal
The average American is 23 pounds heavier than his or her ideal body weight. If we equate "normal" with average, it's not much of a stretch to say it's normal to be fat.
"For children and for many adults who are overweight, they are starting to perceive themselves as the new normal," says obesity expert Robert F. Kushner, MD, MS. Overweight people may dismiss their weight, he tells WebMD, because they feel "everyone else looks exactly the same."
"It's quite clear that people are changing their idea of what an acceptable body size is," says Nicholas Christakis, MD, PhD, of Harvard Medical School. As the average body weight goes up, there's more acceptance of heavier body types.
I guess it has become a safety in numbers thing for tubby Americans.
There is a cure though. Ditch all your fat friends.
His findings, published in The New England Journal of Medicine in 2009, show that your odds of becoming obese rise by 57% if you have a friend who becomes obese and by 40% if your sibling becomes obese."We're social animals," Christakis says. "We're influenced by the choices and actions and appearance and behaviors of those around us."