Hi.
You are not alone--it is a rare woman who can have an orgasm through vaginal intercourse alone. Aside from the g-spot, the pleasurable quarter-sized area located in the vagina just behind the bladder, the vaginal canal has relatively few nerve endings compared to the highly sensitive clitoris--analogous to the penis in terms of sexual functioning.
I commend you for trying to show your boyfriend how to stimulate your clitoris, but don't give up now. Have you tried masturbating in front of your boyfriend to show him how you like to be touched? It might also help to hold your partner's hand beneath yours when you're masturbating to show him the kind of movement you like.
However, chances are no one can stimulate your clit as well as you can, so why not take matters into your own hands and stroke your own clitoris, during intercourse? It'll probably take the some pressure off of your boyfriend during sex and also make you a lot more at ease.
Enjoy and, as always, be safe!