High transfer fee from polygon to metamask

Hey there.
i started mining eth a couple of days ago using ethermine (polygon payment method).
after reaching 0.005 eth, it was sent to my polygon wallet. i synced polygon with my metamask wallet and initialized a transfer.
i waited for the checkpoint to arrive and when it arrived, i realized that the transfer fee was ~$70. the value of the whole transfer was just $18!
what should i do now? is my $18 gone? i couldn’t abort the progress and now it seems that my $18 is stuck in nowhere, waiting for me to pay a whopping $70.
is there anything that i can do?