Democracy or rule of few with power?

Democracy or rule of few with power? 

I am writing this to share my opinion on how i see democracy in US, which is the most respected in the world. What I learned in US Government class in this semester, as well as the last year presidential campaign helped me to think a lot about politics, government and the population. Among other forms of government; monarchy, Oligarchy, authoritarianism, totalitarianism, American People chose to have Democracy as form of government. 
Democracy is defined as a system of government in which power is vested in the people, who rule either directly or through freely elected representatives. Is the system of government in America from the people, and for the people? In my opinion, the answer for this question will be "no". To support my opinion, I will take an example of the US president, how president get selected, before and during the campaign, how he/she get elected and serve.
Allow me to start by the nomination of a candidate. In America, we have 2 major political parties that always compete to provide the next president. At the party level, different candidates will compete to get only one who will represent the party. All the members of the party will have to support the nominee through the campaign against the nominees of other parties, as well as independent candidates. At this primary level, the american people does not have power to select a candidate, but the political party does. But let us assume that the majority of Americans are in those 2 major political parties and assume that they are fairly represented when it comes to the primary elections. 
The wealthy people, corporation as well as different foreign entities step in to chose for us who is going to run for president. Running for president is very expensive and requires a lot of money. For example, According to the Washington Post, the official fund raised by Hilary was $1.4 Billion and Trump $957.6 Million. As planning for other big project, before anyone runs for president, the candidate will make sure that he/she have enough donors to give him/her enough money to run. This means that, behind the scene, the real campaign is when the candidates compete to provide a better action plan that will assure donors more benefits. This real campaign takes place way before even the primaries. The Donors will select the candidate who will serve them better. Any candidate who does not inspire hope to the donors will not be able to secure enough money to run the campaign and will decide not to run. This is how the Few with Power, millionaires, choose one or two candidates, then compete between themselves. 
After the primaries, the donors; millionaires, individuals and corporations, Super PAC will start competing between themselves with their money, behind their respective candidates. A big percentage of this money will be used in the TV and Radio adds, where the main game will be to politically destroy each other, and influence the population to vote for them. This does not exactly say that every time we go to vote, we just go there to confirm an already chosen president, but this laterally means it. 
The same things happen at the majority of all the levels of public positions where we have to vote. From the bottom to the top, the game is the same; before a candidate confirms that he/she will run, the first thing is to be sure that he/she will get enough Money to run, this means that he/she got support from majority of rich people, corporations and international entities. 
Once elected, the elect president will make sure to please his/her donors, fulfill the promises and secure next election as well. That why the elected will listen to their donors, not to the voice of the population, unless this voice of the population can benefit donors as well. This is why we will have problems that are common for all the general population, like gun control issue, but because the billionaires don't have interest in their resolutions, the population will keep shouting in vain. instead of solving the issue, the government will start politicizing it, and against it. The media will step in and show that the potential solution to the problem is a worse problem instead.