That means that no one else efiled before you did and claimed you as a dependent. Has your return been processed and have you received your refund if you were getting one?
Even if no one else claims you as a dependent, you will likely be considered independent for now. Do you think someone will claim you as a dependent? If you met the requirements to be claimed as a dependent by someone else, you are required to check the box that says so.
Have you checked the Get My Payment IRS portal for your stimulus payment: https://www.irs.gov/coronavirus/get-my-payment
