maybe ur tastes have changed? also depends on what ur reading, "stories" is really vague since it can refer to a lotta things and there's like millions of stories around the world so i doubt every one of them are uninteresting. u could also be burnt out from reading
Try reading welcome to undead park
I thought this too but then i reread some stories I thought were masterpieces and was horrified by how bad they were. Maybe your standards are just increasing as you read more.
You matured and you read something a lot better and now you realize how bad of the taste you had. It happens to everyone i think ╥﹏╥
Why does it feel like the stories used to be very interesting, but now they just start and end like nothing?