It is really a person decision, but my advice?  Stick with OT.  I have two more months in my program and then clinicals and I am done.  YAY!  Why do you find it worthless?  What population do you work with?  I would find massage therapy monotonous and boring, but with OT you can do anything and it DOES help people if it is done correctly.  Maybe you would be interested in hand therapy or something more technical???