Your social security number is already in the system so you cannot e-file. If you are a dependent of another person, see if that person filed listing you as a dependent.
In that case, you need to select the option that someone else can claim you and e-file. You could also be a victim of identify theft.
If you don't know who used your social security number, you can print and mail the return with an attached letter saying that it is your social security number and someone else used it. It may take many months, but the IRS will address it and sort things out for you.
Print your return, sign in ink, add any documents needed and use certified mail.
