I cant drink more than 2 bottles of beer. HELP!?

I am 20 years old, 6 feet tall, mascular build.
But Whenever i drink more than 2 bottles of beer , i get am hangover the other morning. But when i look at my friends , they can drink much much more than i do. But still they are fine the other day. I tried all combinations of beer, food,water etc but it still... show more I am 20 years old, 6 feet tall, mascular build.
But Whenever i drink more than 2 bottles of beer , i get am hangover the other morning. But when i look at my friends , they can drink much much more than i do. But still they are fine the other day. I tried all combinations of beer, food,water etc but it still happens to be the same! But i know that if i cant tolerate more than 2 bottles, i just stop after 2.

 I heard somewhere that every individual varies in his capacity , is this true?
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