As a citizen of a state in the United States you are entitled to representation in Congress. Your congressman in the House and your two State senators. The citizens of California receive the representation they are entitled to just as the citizens of Wyoming do. Are you arguing an individual citizen in California doesn’t have three congressional representatives? And that a citizen of Wyoming has more than three?
What you seem hung up on is the citizen of California’s congressman represents roughly 700,000 people, and his two Senators represent 37 million, whereas the two Senators from Wyoming represent 600,000 and the lone congressman from Wyoming represents 600,000.
But that doesn’t mean any individual Californian has less representation than any individual from Wyoming (what is Wyoming’s demonym?)
One man one vote has never been a principle for anything other than the ballot box to directly elect the representatives themselves. In a Senate election or a House election, it is one man, one vote. Each individual gets to cast one vote in each race in their district, no one gets more than one vote. What happens at the Federal level in terms of the portion of political power a region’s representatives receive relative to the population of that region is not at all related to the concept of “one man, one vote.”