I think that there are many reasons that you should continue martial arts training.  I think that they are all very personal and if you can't find a reason or a drive inside you anymore you need to think hard about why you first became involved in martial arts.  I personally want to become an instructor, I see so many of the kids in the classes that I help with have issues in their everyday lives and see what pride and empowerment that the classes give them.  I want to give that to people and see that I can make a difference for people who on their own may not be able to.  I have also improved my life so much since starting martial arts I just want to learn more and more to become everything I can become spirtually, mentally, and physically.  So what I can say is that please before you make any rash decisions please sit and really think about that fire, that drive that started you in the first place.  Good luck