Try asking them. As in the people who might claim you. Usually the people supporting you in some way or form.

No one "claims you" on their W2 The W2 is a document issued by your employer that states how much you earned and how much taxes were withheld from your paycheck.

Perhaps you meant that someone claimed you when they filed their taxes last year - on their Form 1040. This often happens when someone other than your custodial parent has been supporting you - that person may try to claim you as a dependent and so does the custodial parent. In this case the IRS sends a notice to both parties to find out who is justified in claiming you as a dependent, which in almost all cases is the custodial parent.

The IiRS will not diviulge who the other person is, since tax records are confidential. But as Smoothy says, unles there's some type of ID theft going on here it's probably someone who provides suppport to you. How did you find out about it? Did the IRS send you (or your parent) a letter about this?