Yes - Any person who willfully delivers or discloses to the Secretary (of the Treasury) any list, return, account, statement, or other document, known by him to be fraudulent or to be false as to any material matter, shall be fined not more than $10,000 ($50,000 in the case of a corporation), or imprisoned not more than 1 year, or both.
First, go ahead and try to file your return through e-file. If someone else has used your SSN, the return will be rejected.
If it’s rejected, this has nothing to do with your ability or right to file your return. Unfortunately, though, you'll have to file your return on paper -- that is, you can't electronically file your return.
If this turns out to be the case, please see the TurboTax Help articles "How do I print and mail my return in TurboTax Online?" or “How do I print and mail a return in the TurboTax for Windows CD/Download software?” as appropriate for guidance on filing a paper return.
You’ll need to attach a statement, saying that your e-filed return has been rejected, and express any suspicions that you might have. The IRS will make a determination about this, although it will take a few months.