Sex Drive low

My sex drive is next to nothing. I have a 1 year old and I feel bad because my boyfriend loves me so much and wants to make love, but I'm never in the mood. I started birth control last August, and it the sex drive has gone down since then :( I don't want to quit birth control, because I DO NOT want another baby any time soon, but I don't know what to do! I feel like a bad girlfriend because I don't want sex. Even before the pill I didn't have much of a sex drive. He's a much more sexual person than I am too. Opinions? Thoughts? Thanks!