Let's take a step back... take a deep breath... and remember that when you first entered puberty, sex of any kind probably dominated your thoughts too.
This preoccupation will fade and you will find a nice balance point.
Perhaps... a session with your dom will take that edge off... but if I were him... I would make you earn it first... with a spot on good grade or some equivalent result that forced you to focus your energies and find some of that balance within yourself.
That said, do make sure of you dom's intent and intentions. If you feel overwhelmed now... you will undoubtedly experience the worst of the other end of the pendulum if after all is said and done, you end up used or abused and abandoned by someone only interested in their own pleasure.
'New to the lifestyle' subs can all too easily fall for the first dom to come along... and they may seclude themselves and may never return when they find out they were deceived.
What is it that this dom does that thrills you so? I suggest writing yourself a small essay... and write it out. See if you can describe it without mentioning "him" once. So you can see what it is about yourself that you seek and need... and then... you can look and see if that is actually what you get from him... and not just your presumption that that is what he is offering to you.