It's not a simple democracy, no (i.e. "enact a national-level vote for every issue and majority vote wins"). It's a constitutional republic where basically you have 50 mini countries each with different weight in the house of representatives and in the electoral college and a bazillion checks and balances that make repealing existing laws and enacting new ones very difficult. I think the majority of Americans do not like the current healthcare status quo, but getting changes that everyone is on board with through the political machinery is very difficult and Americans are polarized and tend to distrust change plans proposed by the opposite party (since parties tend to propose legislation that favors their own first).