How would you feel if I didn't participate in a group project but still got the credit?
It sounds unfair but is there a reason why you want to do that?
I really want to get better grades in my classes
It's wrong to try and take credit for something that you didn't do. If you don't intend on putting in any effort than you can't expect to get any of the credit for it.
Wow, I really don't get your generation.
It's about taking ownership of something and being a responsible and moral person. I know you have it in you to do great things. I've always admired you because you work smarter than most people, so I think you should at least give it a try, and I guarantee you will feel great about it afterwards.