That's not how social security works. You're not supposed to get a positive return. You directly pay a basic income to retired people (minus administration costs). When you retire, workers pay a basic income to you.
The issue is that, for me and anyone else who reaches retirement age after 2034, only about 80% of that basic income will be available. For reasons I'm not super clear on, this idea tends to get coded as a conspiracy theory in many circles, despite being uncontroversially true and widely reported on.
That's a perennial Boogeyman. Policymakers have a wide array of tweaks they could make (from adjusting the cap to adjusting retirement age) at any time that could push that out by another century. https://www.epi.org/blog/a-record-share-of-earnings-was-not-...
Asking for a positive return on social security is like asking for a positive return on welfare. The positive return comes from not having so many homeless old people all over the country. It's not a personal investment vehicle.
It could be that OP expects Social Security to be kaput by the time he gets to be old.
Looking at the population graph, that’s a valid concern. There’s a ton of boomers and a ton of millenials, but very few babies to pay for our retirement.
(This phenomenon could invalidate even individual stock investment retirement plans as well. We need a future generation of workers, investors, entrepreneurs, consumers).