I'm not going to give my group mates credit
Why won't you give them credit?
I just don't want to give credit where it's not due.
You should include your groupmates in the group. It's wrong to just abandon them and not give them credit if they've earned it.
I'm just not doing it, maybe I'll get other people to do it.
Relying on others to do something you're capable of can make you come off as lazy or rude. It's better to just include your group makes so they can be a part of the project. I'm sure they'd appreciate your help too.