This is extremely wrong on several accounts, to the point of absurdity in several parts.

First, Lenin did not "betray the revolution." Lenin and the Bolsheviks carried out the revolution. Had they not had the real support of the working class via the Soviet system implemented prior to the establishment of the USSR, they could not have established Socialism to begin with.

Secondly, Lenin did not "implement a new form of feudalism." This is utterly divorced from reality. Feudalism is characterized by agrarian peasantry that live on land owned by a feudal lord, till the land, pay rent to said lord, and manufacture for themselves the bulk of their consumption. The Soviet model was that of a Soviet Republic, characterized by Public Ownership and Central Planning, both of which are key aspects of Marxism as conceived by Marx himself, not Lenin.

Third, the election in the liberal bourgeois government. Russia in 1917 had 2 governments, the Soviet Government supported by the Workers and Peasants, and the Provisional Government supported by the Bourgeoisie and Petite Bourgeoisie. The Socialist Revolutionaries won the election in the Constituent Assembly for the bourgeois government, however faith in the bourgeois government was already gone! The Soviet Government toppled the Provisional Government, solidifying itself as the only legitimate government. Lenin did not throw a "hissy fit," the point of the Constituent Assembly was to show just how detached from the will of the Working Class the bourgeois government was.

Fourth, the notion of the USSR as a "totalitarian dictatorship." This is false on both accounts. The Soviet Democratic model is well documented, such as by Pat Sloan in his book Soviet Democracy. The Soviet Republic extended democracy to economic production, and was a dramatic improvement for workers over the Tsarist regime and the bourgeois Provisional Government. The USSR was also not a dictatorship, the General Secretary was not a position of absolute control, even the CIA didn't believe it to be.

Fifth, Marx himself. This is perhaps your most absurd claim. Marx never once said Communism "rises from Capitist Democracy." Marx was both entirely revolutionary, believing reforming Capitalist society without revolution to be impossible, and similarly did not even believe Capitalism was required for said Communist revolution to take place. Marx believed Markets have a tendency to centralize, laying the foundations for Public Ownership and Central Planning. Even in a Socialist state, markets can and will exist. From Marx:

The essential condition for the existence, and for the sway of the bourgeois class, is the formation and augmentation of capital; the condition for capital is wage-labour. Wage-labour rests exclusively on competition between the labourers. The advance of industry, whose involuntary promoter is the bourgeoisie, replaces the isolation of the labourers, due to competition, by their revolutionary combination, due to association. The development of Modern Industry, therefore, cuts from under its feet the very foundation on which the bourgeoisie produces and appropriates products. What the bourgeoisie, therefore, produces, above all, are its own grave-diggers. Its fall and the victory of the proletariat are equally inevitable.

Marx believed Capitalism makes Communist revolution inevitable by its own mechanisms, but not that Capitalism is required to perform said revolution! We see with real, practical experience that the Proletariat is the true revolutionary class, but even in countries where the Proletariat make up a minority of the population as compared to the peasantry revolution is still possible. Markets cannot be abolished overnight, but that doesn't mean it is not a Socialist system.

I seriously recommend you read theory, or revisit it if you're just rusty. If you want help, I made an introductory Marxist reading list, and I'd love feedback.