@itsnotzaahhh I haven't read your whole story, but I did read 1-2 chapters, and they weren't disappointing at all, your writing is great, and it's totally normal for a beginner to think like that, and it's completely okay if there are any little grammatical mistakes (just make sure to recheck your story 2-3 times)
It's your first time writing a story so don't worry about it, and if you really wanna improve more...YOU WILL...
Keep writing, it will get fixed gradually..
I'm not a Proffessional myself so that's all I can say..
Happy writings>>>>>