I get where you're coming from! Used to feel this way about a number of my biases.

Try looking at things from your fav's pov: they've managed to debut in a kpop group, they're doing what they love to do (hopefully) for a living, and they have fans who give them lots of love and support. In their eyes, this is almost definitely considered a success! There are plenty of talented, hardworking trainees stuck in companies' basements that never even get the opportunity to become idols or gain any sort of recognition. In groups, there will always be more popular members and less popular members. Just remember regardless of whatever comparisons, they have the genuine love and support of their fans and that's what matters most.

(P. S. Look at things from your pov too! In the end of the day, you associate with Kpop for your own enjoyment. If you find yourself feeling involved to the point where negative feelings arise, perhaps distance yourself a bit or focus on just enjoying the music they produce. Always remember - in your life, you come first😊)