I know it's hard not to find it discouraging (I really, really do), but I can only say: please don't take it personally. The state of commenting in most corners of fandom is just dire these days.

Not long ago, I was writing in two different fandoms - same me, same writing style, same levels of effort. In one fandom, there was a strong commenting culture and I got a lovely number of kudos and some great feedback. In the other, I got about a thousand hits per chapter - and at most one comment. Most of which were just variations on "update" and one from someone soliciting other readers to finish the story themselves because I wasn't updating fast enough.

People do have something nice to say about your stories. They're just not saying it.