Never horny🤫

I'm 21, healthy (5'2, 120lbs), and I think I'm reasonably happy. My husband (22yo) and I have sex regularly, 3-5 times a week probably. Only because of his sex drive, but I never object unless I am beyond extremely tired. He seems to think our sex life is pretty great. But that truth that I have never told him is that I am literally NEVER horny. At all. Someone could tell me "you can never have sex again" and honestly, I'd be just fine with it. The only reason I have sex is to care for his needs and as a sign of confirmation that our relationship is good. Vaginal sex NEVER does anything for me. I can orgasm when he uses my vibrator on me, but it feels like a purely bodily response to physical stimulation, like there is nothing exciting in my mind that makes it happen. My body just seems to react easily. I'm tired of acting like I'm super into sex just so as to avoid hurting my husband's feelings. But if I tell him, he'll ask what he should do differently, and I honestly don't have anything to suggest to him. I love him very much, and I do find him attractive. Have any of you ladies had the same problem? Have you found any fix for it that worked for you? Please help😬