How do you actually measure height?

nerdybutlazy
How do you actually measure height?
I've never really thought of myself as super small or petite, but I've had this bug me for a while. I have a cousin who is 6'0 feet and he knows that because of his job and compared to him I should be about 5'9 or even 5'10, but I'm dating someone 5'11 and I'm at least 3 inches shorter than him when he stands up straight. I compared my height to other people I noticed I can't tell it the difference that way. So can someone explain it to me, is it possible that you could be 6 feet tall and not look it? Is there a way to measure the height of a person that I just don't know about or something?
How do you actually measure height?
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