I'm terrified that nothing we're doing is going to be enough for a group project
That's a shame. Is everyone else not helping?
I've done my part and I've talked to the others, but I'm tired of trying to get them to listen.
If you are in a school group and doing your part of the work but you know the others are not doing their share, you should talk to your teacher. You don't want to get a bad grade because your group refuses to do their parts of the work.
What, no way. I'm determined to do this alone.
Well you should not have to do everything alone. You could really burn out. Your team needs to pick up the slack and contribute.