No, you did not lose it. Since you had no taxable income for 2019, there was nothing to apply the loss toward. If your only income is Social Security and will continue to be only Social Security, then you will not have occasion to use it.
If it did not carry forward, then you can manually enter it.
Open your TurboTax return, search for capital loss carryover, and then select the "Jump to" link in the search results.
