Sex feels like a chore..

My husband and I have been trying to for a baby for over a year now. We're both only 23 years old. I feel like sex is more of a chore now than it is about being young and in love. Since trying to get pregnant has failed month after month I have no desire for sex anymore. It's literally like pulling teeth and nails to get me in the mood. I know it's nothing my husband is doing wrong it's literally just me. I don't know what to do.... any ideas?