Okay, unless your are obsessed with sex and it is interrupting your day-to-day life, your sex drive is NORMAL. You a once-a-week-er?? You masturbate multiple times a day?? Either way there is NOTHING wrong with you, but I agree that it can cause some tensions in a couple if your libido doesn't match up. Two solutions:
1) Masturbate. Lots of women know how to masturbate, some are seasoned masters, but lots of ladies that experience continued sexual frustration haven't tried out all their options or really practiced enough. Buy a vibrator, search it on the internet, buy a book, set aside some alone time. If you think your husband will feel "threatened", have a proper conversation about it. If you are weirded out masturbating while other people are home (ladies are more paranoid about this in general, thanks society), make sure your vibrator is water proof and have a long shower. No body will know if you don't want them to, and you will feel better.
2) Talk to your husband and work out something for both of you. Hubby have a hard time having sex because he is tired in the evening? Both of you commit to getting more sleep, or give morning sex a whirl. Does stress stand in the way of sex? Communicate to each other when you feel like it's just "too much" so that neither of you feel offended. Try exercising or a way to relax together. Do your libidos just not match up? This can happen- not everyone wants sex the same amount, there is NO "normal amount of sex". See how much would work for him, then make up the difference with my first point.