The United States is not a Democracy and never has been. It's a Republic. Each state has a republican form of government, and that means elected representatives make decisions on behalf of the people.
Urgh. No. The US is both a republic (a form of state in which the country is considered a "common good" and not the legal propriety of the sovereign) and a democracy (a system of governing in which all citizens have an equal say in the choices of government). I don't know why this is so difficult for some people.
Um, maybe it's because those people grew up saying the Pledge of Allegiance in school and know they didn't pledge allegiance to a "democratic republic" of the United States? Maybe it's because nowhere in the Constitution is the United States or any state government referred to as a democracy? Maybe it's because states and territories call themselves many things (republics, commonwealths, protectorates) but not one is referred to as a democratic republic?
The United States of America is a REPUBLIC. It was designed as a republic based on the First Republic (Rome), which had some democratic processes but was not a DIRECT DEMOCRACY like Athens or Sparta, something most people who are actually educated in history more rigid than Social Studies actually get. Perhaps you ought to pay more attention to people who find your idea of a democratic republic "difficult."