No, His Sweet Song, it is not wrong to want more, it just means that you are growing and learning. If at anytime you tell yourself that nothing needs to change or evolve or improve in your relationship, you are basically on your way out. Even in "vanilla" relationships, everything is up for revision, discussion and compromise.
I would suggest that you both need to talk about it and decide what is it that you can live with... for now and until when are you willing to do so.
Being submissive and/or living the lifestyle may mean very different things to most people. That much I have learned in these forums. If you are happy part-time or in the privacy of your own mind, then all is well. If you really want more remember that your bdsm orientation need not define the whole of your life and personality unless you want it to and you are ready to be true to that ideal.