Democracy is a lie, even in America.
Everyone in America could want a change of pace and it wouldn't matter, we'd still get a another Rep or Dem figurehead.
Clinton won the primary because she got a majority of the votes. Trump won the primary because he got a strong plurality of the votes and the republican nominations are less democratic by design. The problem isn't democracy, the problem is that you are a minority. So you are pissed off that the system is WAD.
...Nah, I'm not in a minority. Most people are dissatisfied with our elected officials. The system is broken in that it's all-or-nothing: We either vote for one of the awful leaders who have a chance, or the vote is entirely wasted.
In a parliamentary system I would have an actual shot at helping a green candidate get elected. That candidate's potential to join a coalition would make real, significant, proportional difference in the nation's government. Or my candidate would lose, but at least I'd have a chance.
Whereas it's mostly pointless and largely dangerous to vote for a third-party candidate for President. We're being blackmailed into participating in a farce, a mockery of actual choice.
I voted for Clinton, I think she'll be a more effective president than Sanders would have been. But it was a shit choice to have to make, and the majority of people agree. You're right that the system is working as designed, though. It was never designed to let the common people choose their leaders.