First and foremost, I NEVER recommend lying.
However, if you HAVE been lying... that's a tough situation. Honestly if it were me, I'm not sure I would fess up to the lying. What I WOULD do is figure out what worked for me (this can take some time and a lot of practice), and once I figured it out, I would show my boyfriend what I like. Depending how open you are, you can masturbate for him (men will never complain about this). If not, you can gently nudge his fingers in the right place, suggest positions, etc. and let him know how good it feels for you.
As someone who masturbated for years (I am 22) and could not give myself an orgasm for the longest time, I understand your frustration. I could not get pushed over the edge from fingering (whether it was me or my boyfriend doing it), oral sex (I know this works for many women) - while it felt good, I just couldn't come, vibrators (once again, felt great, but didn't cut it), G-Spot stimulation, clitoral stimulation... NOTHING was working.
One day, while playing around with a small vibrator, I was laying on my stomach while I left it down there. I noticed if I rubbed myself against it, it felt good. I had the clitoral stimulation AND pressure. I noticed if I put a pillow between my legs and rubbed against it I could achieve an amazing orgasm everytime within minutes. (I realized I didn't even need the vibrator, the pillow was enough).
The next question was how on earth do I make this work with a partner. Answer: The coital alignment technique.
If you google it, there is loads of info about how to do it, and it's slightly tricky at first, but amazing and easy once you get it. I personally recommend doing it with the woman on top.
Essentially, when you're on top of him, lower your pelvis an inch or so so your clitoris will be pressing against the base of his penis/pelvic bone. Instead of thrusting, think about "grinding"/rocking back and forth. Having him lift his pelvis up helps a lot too. Rock back and forth and you should get there in no time.
I really hope this helps! Good luck!