TLDR: I have a higher sex drive than her and its causing problems - will it ever work, can I fix it? How? I want to try!
I had a similar issue with an ex, she had some personal issues that caused her sex drive to plummett, and while I was 18 at the time (she 19) I was a rampant leg humper, she felt I only wanted one thing, and any time I tried to show any affection, hugs, kisses, stroking the neck, she assumed I was trying to get her aroused, when most of the time I was just enjoying the contact.
After a while I'd travel half the country to see her (at uni at the time) end up having sex once when I got there, or while waiting for dinner to cook, and that was my lot.
Ended up with me feeling more like a "friend" or "companion" than a lover, so things ended.
Fast forward 5 years and we ended up getting back together (unintentionally), we'd hooked up a few times during those 5 years when we were both single and in the same area, or I took another cross country drive to go see her, but anyway, we got back together, had an open relationship so I was able to vent my sexual needs elsewhere and be there for her when she needed some of me, and of course the romantic side and support etc.
She got to have other partners (one of whom she left me for) cause he was a much more emotional person, somewhat broken as a human and she loved the sick puppy thing.
However:
This can be annoying, people with totally different sex drives don't really work, it causes you to become frustrated.
I had a GF that was literally horny every 2 hours. Now I know it sounds like a man's best dream but it really is not. It was great for the first 2 months, but then it became an absolute chore and I was exhausted 24/7
I've had similar again, a few exes who would jump me any time I even looked at them, and fun for the first few months, when you're knackered and want to sleep, and they're groping and grunting, 'Other Mac' is going to respond whether he wants to or not! Which gets awkward trying to deter any action.