A tough decision to make but ultimately the right one if you're not 100% committed to it.
As the others have said there is no shame in not continuing (it's not quitting...) the racing as you've been there and given it a try.
Thanks for the help and support over the race weekend and also the testing trackday. Make sure you come along and a bit of support my way wouldn't go amiss at future rounds
BTW, anyone want any spares off his bike before I give it back?