What you're describing is a pure democracy, which the US does not have; it is too burdensome for anything bigger than maybe a town council. We have a representative democracy, where each region votes for someone to represent the our and our neighbor's views to the central government.
From your description, the Association of Realtors you directed was not a democracy.
You're not alone in your criticism of Congress. There is more than one mechanism in our system that leads to people feeling as if they aren't being heard, and there have certainly been plenty of legislators that have taken advantage of all of them. The system, however, is set up so that if enough people feel that way about a Senator or Representative, they get voted out in six or two years, tops. That is their incentive to listen to us; whether they do is your perfectly valid opinion.
And parties aren't part of the design. They are more or less independent institutions that aren't mentioned or considered in the Constitution, though some laws have grown up around them over the years. Parties are convenient groupings of constituents that band together over a common central issue, and their platforms and goals and who sits where all change over time as issues do. That means you're right that no party will ever fully represent any of us, individually or as a group.
