Why do I not find sex pleasurable?

Hi doctor,

I am a 21-year-old female in a monogamous relationship. I am a practicing athlete and eat right as far as I am concerned, and so does my partner, whom I love endlessly. We live together in a comfortable, financially secure, and stress-free environment. I have never undergone a traumatic event or had a poor sexual experience. However, I have a major problem. What I am going to describe may resemble asexuality, but I assure you it is not. I do not enjoy or crave sexual activity. I do not become aroused during foreplay like every other lady I know. No fluttering in my stomach, no racing heart, no tingling in my genitalia, and no urge to fulfil a need. I know this exists and that I can feel it because I have rarely done it. I want to have sex because I enjoy my partner's physical closeness and making him feel wonderful. I also enjoy massaging his feet after a hard day. No passion, no excitement, so no plateau. Now, vaginal and clitoral stimulation feel quite different, and I am numb and not experiencing the feeling.

Consider that lubrication is never a problem, as my vagina becomes instantaneously greased at the first touch itself. Regarding clitoral stimulation, everything other than a vibrator is aggressively unpleasant. Whether the stimulation is oral or manual, I am not feeling good. So, we believed a vibrator would fix the issue, but I do not feel anything when my spouse uses it on me. If I am doing it by myself, orgasm is never guaranteed. On the rare occasions I experience one, I must use the vibrator on the maximum setting for an extremely long period, and even then, the orgasm is very faint. I am lost and unsure of what to do. This has nothing to do with my boyfriend's lack of experience or with my discomfort around him. I am anxious about my sexual life and want to enjoy sex and feel excited. If you shed some light on my situation and put me on the correct path, I would be extremely grateful, as I have received zero helpful responses from previous doctors. I truly appreciate your time.