Update
Here are some rough numbers I found quickly (because your numbers are obvious nonsense):
President
R - 77.3m - 49.8%
D - 75.0m - 48.3%
Others - 2.9m - 1.9%
Senate
D - 55.9m - 49.1%
R - 54.4m - 47.7%
Others - 3.7m - 3.2%
House
R - 74.4m - 49.8%
D - 70.6m - 47.2%
Others - 4.6m - 3.1%
Looks like the system is working to me. The Senate vote not withstanding of course because of some smaller states, but it's not some extreme miscarriage of justice as you imply. The majority party won and is currently enacting policies that voters wanted. I'm sorry that your beliefs aren't as popular as you thought.So fewer voters and constituents for a pretty significant majority in senators.
So if 49% of California voted Republican, but both Senators are Democrats, then the entire population they represent should be counted as Democrats.
A flawed argument.
It also completely ignores the entire reason the Senate exists in the first place, to represent the States.
What makes you say that Republican senators represent a minority of the population?
There is no real way to determine the population in each state represented by a party other than votes. The presidential vote tallies (the only truly national vote) are the closest we have to this. Numbers in the Senate are fairly close to the popular vote (not a coincidence).
Republicans have a majority in the Senate when their senators received a minority of votes, by about 24 million votes.