Hi,
Birth control can put a damper on libido for many women, but there are other factors that can also play a role. Any illness, depression, medications, psychological issues, hormone levels, and low thyroid function or thyroid disease can have a direct negative affect on sex drive. Have you ever spoke with your doctor about this? If not, consider making an appointment to speak with your doctor about having your hormone levels and thyroid checked (by blood tests), to see if these have anything to do with it. You might also want to research female sexual dysfunction (primary anorgasmia or orgasmic dysfunction) for more information. I hope you find an answer soon :) Good Luck!