It's like that all the time. You gotta get used to it. You will always notice "things that are better" in other people's work. I've read a few chapters of Lac's work and instantly was hit with the realization of how much better his style is and yet he has so few readers.
You can always use other's work as a benchmark for yourself, striving to be even better in your mind. But, don't get yourself too much down. There are definitely tens of people enjoying your work. Never forget that ever. It's good to strive to be better, but don't let that blind you from already being "good".
+1 on Saileri's comment. I think most writers would have gone through that feeling at least once. If you want to, you can take a short break and regroup, but I would say that you can keep at it. I mean, your work right now (if I'm lookin at the right one) has so many readers and favorites already for you to give up on writing.
Surprisingly, @ForestDweller story was the one that gave me the vibes of how bad I am as one of the first ones. When I read it I had a feeling that I would never be able to achieve such a level of storytelling. So yeah, it goes both ways.
Honestly, I didn't have time to venture far. I'm I think somewhere around ch33 only since I'm really busy. Writing even at this moment. I just felt that your style and the way of storytelling was far superior. It read good, felt good, characters gave an impression that they are really well-thought and planned and such.
I do try to plan out important characters as best as I can, especially the harem members, which is why even though having a slave harem member is kinda a staple for isekai, I didn't add one, since I just can't come up with a satisfying character progression and backstory for her.
There's a misconception that using "fancy" words or an enormous variety of word choices that aren't common makes the writing better. It's ok to occasionally take out the thesaurus, especially when repeatedly using the same word in a few paragraphs next to each other.
But once you start using uncommon words, you lower the story's readability. Simple, clean, and direct language is better than showing how great your vocabulary is. If your reader can't understand it, then it's wasted.