PLEASE HELP: CRISIS

I don’t know what to do. I feel so bad for my fiancé. But I also feel bad for me. I have an extremely low sex drive. My fiancé has an extremely high one. On a scale of 1-10 I have like a 0.02 sex drive and he has a 1537327943 sex drive. He always wants to have sex and I’m never in the mood. What is wrong with me? How can I change this? I want our relationship to be whole again.

Please help