Unless you are cooking the figures, I don’t see how that can be true. You are saying that the sum of your previous payments, in nominal value, equals 360 * your current estimated SS payment? Your SS contributions are capped at just over 6% of the first $115k. I think you need to check your math.
If this had been set up as a simple investment plan paying compound interest, over the normal 50 year span of paying into the plan out of every paycheck — most average working people would have accumulated well into 1 to 2 million dollars.
Consider also that when you start drawing funds in your retirement, you are still gaining interest on the remaining balance.
Of course these assumptions are based on compound interest being paid on investments. That isn't happening during the current reign of king barry because the government is robbing us blind through currency manipulation.