You are a "qualifying child" (QC) dependent for your aunt. This means she is most likely claiming you as a dependent and receiving the appropriate tax benefits. The Child tax credit (usually $1000) is no longer available once the QC turns 17.
As others have said, YOU cannot get money "from tax". Only the adult, related (e.g. aunt) taxpayer, with reportable income, that you live with can get money.
1. claiming kids as dependents (but you are not allowed to claim yourself as a kid)
2. have some earned income (wages or self employment)
Without earned income or "qualifying children" you are not eligible for the "refundable" Earned Income Credit or Additional Child Tax Credit.
Furthermore, there is a rule that says IF somebody else CAN claim YOU as a dependent, You are not allowed to claim your own exemption. If you have sufficient income (usually more than $6300), you can & should still file taxes, you just don’t get your own $4050 exemption (deduction).