If you have trained in martial arts, then you are well aware that the "martial" aspect is but one of many disciplines that are taught. Others are concentration, mental discipline and focus. Your urge to hurt something means that not only are you human, but that your mentors in the arts have not taught you how to focus anger, rage, impatience and other negative energies onto positive ones.
I will be the first to admit that I am unfamiliar with ju-jitsu. I am going to ASSUme that like any martial art, that mental discipline and emotional discipline are tenets. If they are not, I would strongly suggest you try your hand at a new martial discipline - one that does not put such a heavy focus into the martial aspect.
If you train in martial arts to become a better fighter, then you are putting a lot of work and energy into something that you may never use. In fact, most martial arts stress the avoidance of violence and teach you how to girder yourself emotionally and mentally against succumbing to violent urges - revenge being one of those urges.
If you truly train in martial arts and embrace the philosophy and tenets of them; then you get a lifetime of use out it.