What's wrong with me?

Natalie
What's wrong with me? I'm forty yrs old, i've been in 2-3 short term relationships throughout the years, I'm now in a committed relationship for 9 months we both want to settle down get married and start a family of our own but what I've noticed in all my relationships is I have very little sexual response, sex for me has been routine, no sexual desire. any suggestions? Please help!