Never experienced the Big O!!

So I've just lost my virginity I'm 19 to my Bf and for a while it wasn't the best sex, you would think because I'm a virgin I wouldn't be able to tell but I faked it for a minute but last month (been together for 5months) I told him I've never came ever but he always does within 10-15 minutes of swx which was ok because he was happy I guess but I wanna come to how do I help him help me?!?!! It feels great but I never orgasm???