You'll get there.
I've been an occasional leisure cyclist over the years and tended only to use two gears - the highest one on the middle ring, and the highest one on the big ring.
Last year I took cycling up seriously and have done a lot of work on a gym bike. I read somewhere that 80 was a good cadence, but that you tended to slow down a bit as a you got older, so I settled on 76. I spent hours and hours grinding away at 76 rpm.
Move on about 8 months and I usually do my warm-up at 88, but as I put up the resistance I get faster. When I'm really pushing I'm generally above 100.
I've no idea if I'm as high as that on my road bike, but I very rarely use the top gear now.
One strange side effect is that I used to really stride out when I was walking, but I seem to take much smaller steps now although walking faster. My cycling seems to have adapted my legs to a different rhythym.