I'm going to go behind my lab groups backs
Going behind their backs to do what?
They're planning on going behind my back. I just know it. I have to do it first before they do it to me.
You shouldn't try to sabotage your partners. It's better if you all work together to get the work done so you all will receive your credit.
I think I'm smarter than them so it is better for me to do my part. I don't have to follow their ideas from the beginning.
You shouldn't assume that you'll be betrayed, especially without evidence. Backstabbing them will hurt you as well, since you'll be graded with them.