If you are Single and have no dependents to claim on the tax return then your Filing Status is Single. You cannot claim yourself as a dependent. Nor can you have Head of Household Filing status if you do not have a qualifying person as a dependent on your tax return, among other requirements.
See this TurboTax support FAQ for Head of Household - https://ttlc.intuit.com/turbotax-support/en-us/help-article/tax-filing-status/qualify-head-household...
