21 year old dude year in a similar situation. I'm just here to tell you that your waaaaaay more normal than you seem to think. I know that I am perfectly comfortable being a virgin at soon-to-be 22. I can't help but feel that hiring a prostitute for sex simply for the sake of sex is going to be a mistake you'll regret.
As other's have said relationship does not translate to sex. As such, sex certainly doesn't need to be on top of your priority list. Don't fret over it too much.