In what ways does the U.S Presidency support and limit the formation of an ideal democracy?

They support it by implementing a voting system which is ideal to get the people involved in laws and rights. They limit that by age qualification for voting, not being able to vote till your 18. However with this support and limitation the Presidency still has the higher power and control over the so called democracy.





Also I found a video on youtube that explains how the voting process works and which votes are counted for who wins the election- popular vs. electorial. This is another way on how the U.S Presidency limits an ideal democracy because only the elector votes count, when ideally it should be the popular votes because that is what the people want.
 
Critical question: If we counted the popular votes and not the elector votes, would the U.S have had the same Presidents and would counting popular votes get more people involved in voting?