People think we start with a basic set of emotions, like happiness, sadness, fear, anger..... I don't think that is true. I think that comes as the brain develops. I think those feelings develop from more primal emotions, like a sense of something being wrong, feeling threatened, etc. I think rage is a less developed emotion, so if you start feeling things, you probably start from the start.

You could try to separate in your mind, the parts of rage. What is the threat part, the anger part.. a fear part? Rage is very interesting that way. I don't think you can actually "use" rage, I don't even think you can use it to do bad things, because rage controls you, you don't control rage. But certainly it is a feeling worth looking into.