You have mixed desire.
Having mixed desire means you experience both spontaneous and responsive desire.
Spontaneous desire means you start to crave sex before any sexual stimulation even starts. This is the kind of desire that tends to appear “out of nowhere”, prior to initiating sex or touch with a partner. This type of desire tends to be more common amongst men than women, and it’s also more commonly experienced in the early stages of a relationship when you feel like you can’t keep your hands off eachother.
While this is the way desire is typically portrayed in mainstream media, this is not the only way people experience it. Responsive desire arises as a response to sexual stimulation, not prior to it. This is especially true for couples in longterm relationships who outgrew the honeymoon phase, and is particularly the case for the large majority of women. A lot of people whose desire is more on the responsive side tend to think that they have low libido, but that's not the case. What you need is to stop expecting your desire to constantly show up spontaneously, and to learn how to curate the sexy context that allows for your desire to arise in the first place! This is because responsive desire tends to be highly affected by context.
Remember though, the way our desire functions tends to ebb and flow with the rhythms of life (which is completely natural) and spontaneous desire isn’t the only way to experience desire. A lot of people's desire (most especially women) tends to be more on the responsive side. This means that it arises in response to touch and sexual stimulation.
In a nutshell, spontaneous desire arises in anticipation of pleasure, while responsive desire arises in response to pleasure. No one type of desire is better or superior than the other, nor does it mean you’re more or less attracted to your partner.
But here's another surprise : all desire is responsive and context-based, some people's desire just feels more spontaneous because they tend to be more sensitive to sexual stimuli (that's where our sexual brakes and accelerators come in - to learn more about that, take this quiz). The more you learn about the factors that inhibit or stimulate you and your partner's desire, the more you'll be able to enhance your sex life together!