He was born in a middle class family and her mother died when he was a kid.
He wanted to become a soldier, to fight Nazis.
But he couldn't become a soldier because he was physically too weak.
The general Chester Phillips made him a proposition and asked him to test a government's experience. To make it possible Professor Reinstein injected in steve's veins the super soldier serum that made a "superman" of him.
To conclude Captain America is a superhero created to fight against Nazism. He is a defender of free world. He hasn't super powers but physical and intellectual abilities. He is used in many cinematographic adaptations. Captain America represents the American Patriotism.