yes. you missed on the $1200 stimulus payment (at most). you'll have to wait until you file the 2020 tax return to claim it
if you have been the victim of identity theft you need to take steps to secure your personal information
https://www.irs.gov/pub/irs-pdf/p5027.pdf
as to filing form 14039 - Identity Theft Affidavit see this from the iRS
https://www.irs.gov/newsroom/when-to-file-a-form-14039-identity-theft-affidavit
