Slice of Life Romance
Since there is a lot to mention here, I'm going to list the positives first and then some areas for improvement.
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Interesting characters - Your main characters, the female MC, male MC, and the best friend, are fleshed out well. The reader can get a good grasp of the different characters and their personalities.
Romance plot - The tension between the two main characters is good, as the reader can see the issues between them, and you have some balanced scenes that show their chemistry together.
Pacing - So far, the story is too fast-paced. In the first chapter, we are shown many characters, so it's a little hard to keep up with everyone. And instead of jumping right into sexy time, have a little bit of build-up before the story's trigger.
Show, don't tell - The writing is more telling than showing. For example, in the first chapter, the MC basically tells the reader their backstory. Rather than info dump the information, try to show it through dialogue and actions.
Character development - We are supposed to follow the MC, but the MC doesn't seem to have any goals or thoughts outside of the love interest. For example, does the MC have any plans for the future? What does she strive for? Does she want to travel, have a family, etc.? Also, we don't get any of her thoughts, just her telling us everything that is happening. In first person, the reader should be inside the character's head, so we need to know what they are thinking.
Writing - Some commas are missing, and there are a few run-on sentences; however, these issues can easily be fixed with some editing. Also, you had some word echoes, but again, a simple edit can catch those repeated words.
Overall, the story was enjoyable to read, as I liked the growing relationship between the two leads, but I feel the story needs some fleshing out. Try to expand the MC outside of the love interest and his family. I know you had the chapter about the MC's brother, but is there more to her family? Maybe explain why the MC's brother spoils her, etc.