I am the same as you too.. A 23 year old virgin who is into BDSM.. Just wanted to let you there are a still a few of us out there and you are not alone in this.. My advice is explain to your Master that penetration is a hard limit for now and when you find the right one you feel you want to go all the way then just do it... I know some thinks virginity is nothing but to some it means something... you don't want to just sleep with someone because it is what everyone is doing... just do what you feel is right.. Sorry if my advice is such cause im a 100% hopeless romantic ;-)