I'm so glad you asked this question, because it affects a lot of couples. There may be several reasons your sex drive doesn't match your husband's. You could be low on testosterone, the hormone that increases sex drive in both men and women. You may have a legacy of pain from a sexually destructive past incident. He may be into sex purely as a mood-altering behavior, in which case it will feel unloving to you. One thing's for sure: by having sex just to keep the peace, you're killing off any chance of feeling real desire. Anger, resentment, and placating the other person are HUGE turnoffs.
I strongly suggest that you and your husband consult a sex therapist. Whatever the biological or psychological reasons for the mistmatch, a professional can help you sort them out.