@Reotra
Repeating a previous reply in this thread; which appears to apply to you:
At this point, you have two choices:
1. Don't claim yourself (check the box on form 1040 that says somebody can claim you) and you can e-file.
2. File a mail-in paper return. The IRS will send you your refund and sort it out later. See below, for details.
As others have suggested, the 2nd issue here, is do you really qualify to claim yourself. Your relative does not need your permission to claim you. He only needs to meet the rules.
See full rules at: https://turbotax.intuit.com/tax-tools/tax-tips/Family/Rules-for-Claiming-a-Dependent-on-Your-Tax-Ret...
A 3rd issue is what are you trying to get by claiming yourself. With the tax law change, effective 2018, most dependents will get the same refund whether they claim themselves or not. The personal exemption has been eliminated and the standard deduction increased.
If it's the stimulus money, you're after. That can wait til next year. The paper filing will delay it several months anyway. In essence, the stimulus check acts as an advance of your 2020 income tax refund. This means when you prepare your 2020 income tax return, next year, there will be a line, on the forms, to claim it, if you didn't get it in this year.
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If someone else claimed you, as a dependent, inappropriately, and if they file first, your return will be rejected if e-filed. You would then need to file a return on paper, claiming yourself, if appropriate. The IRS will process your return and send you your refund, in the normal time. Shortly (up to a year) thereafter, you’ll receive a letter from the IRS, stating that your exemption was claimed on another return. It will tell you that if you made a mistake to file an amended return and if you didn't make a mistake to do nothing. The other party will get the same letter you did. If one of you doesn't file an amended return, unclaiming the exemption, the next letter, from the IRS, will require you to provide proof. Be sure to reply in a timely manner.
Winner gets the tax benefits; loser gets to pay the IRS back with penalties and interest.
