You have the opportunity to make an impact. But it requires an extraordinary amount of work to make your voice heard over the other ~324M people. As it should.
0. There's no direct vote on laws. This alone makes the US not a democracy, but a republic at best. 1. There's no direct vote for president and vice president. 2. Elected representatives or the president do not care one iota about their constituents between the elections. If you think they do, explain things like TPP 3. Two party system merely creates the illusion of choice. Both parties are right wing, with democrats being slightly more centrist.
Here is a good discussion of these differences: http://www.lexrex.com/enlightened/AmericanIdeal/aspects/demr...
Actually, it most often representative democracy, which may be a republic, but may just as easily be, say, a constitutional monarchy.
Why do we need so many middlemen? Is this _really_ a democracy? Or is it a mere visibility of "rule of the people" designed to keep the working class, well, working, for the benefit of the ruling class?
For some reason you are arguing as if a direct democracy would somehow magically address the problems you outline for a representative democracy.
But in all but the smallest organizations, a direct democracy is simply unworkable and so your complaints don't really move the discussion forward. Do you want to go to the ballot box once a week to vote on every decision currently made by your representatives at the local, state, and federal level? Do you think that is more workable than a representative mechanism?