Unfortunately, TurboTax does not have the capability of reviewing returns to tell you where your social security number was used, whether it be in the case of identity theft or if used by someone who claimed you. This will need to be resolved with the IRS.
You may want to ask any close family members, such as parents or grandparents, if they claimed you. That would be the best place to start. Information regarding tax identity theft can be found in the links below.
IRS Taxpayer Guide to Identity Theft
IRS Identity Theft Central
Tax Tips if You Have Had Your Identity Stolen
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