I'm going to pull out of a group project at the last minute
Why did you enter this group project in the first place?
I didn't think the project was going to be so much work
That's really unfair to your group members. You shouldn't leave them hanging. You could fail the project if you don't do the work.
I don't really care.
You should care about your assignments and your peers. It may not seem to matter now, but no one will want to work with you if you have a reputation for abandoning your work.