Haven't heard of Libby, but there's also 'Axis 360', 'hoopla', and 'OverDrive'. My library uses all three. You choose a book and it'll only be available on one of the apps.

I tried reading in public transportation. It worked for me 1% of the time. I just get distracted by anything and end up watching the view.

I managed 80 last year and 100 before that, I agree, if you get a Kindle you can carry it everywhere and read during waiting times. I do most of my reading in a one hour commute and about 30-60 minutes again at night in bed.