I have never really had a need to rant, but when I do, I enjoy it. I think there is something deep seated in your mind that that is causing this needless unending rant. Do you feel like you aren't being listened to? Or is it a need just to have a voice regardless of the subject? Or it could be that you just have a lot going on and your mind knows that you need to get it out. I don't really see ranting as a bad thing, as long as you are careful about how you do it.