I'm going to get a co-worker fired for something I also did
What makes you think you shouldn't be fired like them?
I've been trouble free and I don't think what she did was severe and I'm fine with it.
It is lucky of you to have not being caught like your co-worker but you should take responsibility for your actions. You will be caught and people will think you deserve to be punished.
I'm going to get away with it.
Probably you will get away with it this time but maybe one day you will get in trouble if you keep this attitude. Your coworkers won't trust you anymore if you don't accept responsibility for what you did.