This virgin needs help!!

Ladies I'm almost 19 and still a virgin, I've been seeing this guy (he's 22) and things are getting serious! 
We have been a little bit sexually active but he's only ever done stuff to me and I really want to pleasure him but I'm kinda scared I'm going to fuck up and just make a fool of myself to him how can I get up the confidence or even get the courage to just go for it?