I'm going to refuse to change my class schedule because I simply don't want to even though my whole group pressures me to do it
Why do they want to change the class schedule?
They think we need more time together to do group projects.
There is nothing wrong with sticking to your guns in this situations. You do not want to put yourself in a situation where you are doing whatever others want you to do.
It's very tough to argue with them.
I don't think you have to argue with them, just put your foot down. School is important and you should take the classes that are best for you, not your friends.