I just don't feel worthy of receiving the Eucharist. Is it okay to just attend Mass and not receive the sacrament until I feel worthy again?

If you are in a state of mortal sin, you shouldn't receive the Eucharist at Mass, but I don't think that is what you are asking. None of us are worthy to receive anything from God, that is why it is called Grace.

As a friend defined Grace once: Something Good that you don't deserve. Which is precisely what the Eucharist gives us, Grace. Unless we are in a state of Mortal Sin, we should avail ourselves of that Grace as much as we can.