The Origin of the Surplus Value

Capital is like the actual living labor being done, remunerated with a wage. The more my labor is productive, the more value i'll generate, and then the more surplus falls to the capitalist for the same amount of wage needing to be paid. So this satisfies all the conditions of the economic problem where we are exchanging equivalents for equivalents. But on the other hand, because of the sort of specific form of the wage relation, i'm, as worker, able to generate more value than i'm paid. That's where surplus is coming from. How does constant capital produce surplus value? I don't know, do you aill have a kind of sense for this? This is something