I really want to talk about my friends behind their backs
Do your friends do the same to you?
Not always but they do it more often than not.
Gossiping about people behind their back is shady. You could say something to offend them and lose your friends.
Nah, they like to gossip and also I'm not being any worse than they were
Gossip is harmful to friendships even when there's no bad intentions. Besides if you aren't saying something that would offend them, why do you feel it's necessary to say it behind their back?