Your payments to SS/MC paid the benefits of those who were drawing on the systems at the time you were working. It was a transfer out of your pocket into theirs. If there was any excess left over, it was used to finance the deficit at that time by buying the current issuance of US Treasury debt.
What I’m telling you is that the money you put in is gone. Spent.
Nothing you wrote, which is all true, we know that, refutes what I wrote.
I made an investment. The layabouts collecting our tax dollars via government handouts invested nothing. Except, in the case of SSI, a lawyer’s fees so they could get on the gravy train.