Nobody read my story on Wattpad and I wonder what I did wrong?

I have to admit, I can absolutely understand why your story has hardly been read. The best way to get into a potential reader is to follow his steps.

A new story is usually found about the tags. You have some, but there have already been some spelling errors (eg Lestrange instead of Lestrange). Of course, all miswritten do nothing to find your story. So check everyone again.

Now, if the potential readers were looking for the right tags, your story is only one in a very long list. From this you have to go through cover and title somehow. You won't.
The title "You and Draco – your own love story with the Slytherin Prince" doesn't make a little curious. At the same time it leads to a completely wrong drive: you think you have written a story from the reader's point of view. Also your first chapter (About you) makes this impression. But you wrote from my perspective and invented an OC (Kira Canver).

Your cover has been much better for you. You have the author on it and you can read your title, which is not self-evident. It is definitely enough for your story to appear more positive in the long list, really attracting it does not.

Now, when someone clicks on your story, the short description or the "folded text" of your story comes. You didn't write that. Instead, you give a bunch of unnecessary information that doesn't even belong: The perspective is experienced in the book, so it doesn't have to go in, your age and the information that it's your first story is scaring at most. You can keep the note that you are happy about feedback. But I would write it after the short description and clearly separate it (eg by empty lines).
I don't know really important things. There are thousands of stories about a love story with Draco Malfoy and yet they are all very different. A few tell about the forbidden love a la Romeo and Juliet, others tell about the eternal secret love or the forced marriage, which then leads to true love. So to assess if your story is the right thing for me, you need to give some information about the conflict. The difficult thing is to give so little at the same time that the reader is not spoiled.

Now, if you follow your book, you come to the chapter "on you". This chapter has two problems: content and perspective.
The content sounds very hard now. The problem is not that you give the information, but how you give it. You're throwing a bunch of facts on your reader's feet. This is boring to read, but also simply bundled bad to remember.
Distribute the information more about the story. I don't have to know all this after the first two seconds. Spread everything in a casual manner. For example, you could know your name when it gets discussed at some point. If that's only in chapter two, it doesn't matter, you're just following me. Your house could be experienced if it attracts her school uniform, goes into the community room or sits on the appropriate domestic table.
You should also take the principle of "Show don't tell". Don't tell me she's friends with Harry or impatient, but show me. She finds the stairs in Hogwarts annoying, sometimes changing the direction? Then let them stand before one in your history, let them wait for someone, etc. Your reaction at such moments lets your reader know that she is really impatient and you don't just say it.
The Du-Perspective you use also only creates further confusion at this point. The reader simply expects something different and asks more why now it is claimed that he is a person if he does not appear in history at all than that he can focus on the information. At the beginning, decide whether you want to install the reader, so there is a "you" or not.
My personal opinion is, leave it. I'm an absolute hater of this "you." I know it is supposed to create a closeness between main character and reader (they are a person), but with me it has the opposite effect. I'm not the figure you created. However, if you say that I would have acted like this in the situation, I only think: "What a garbage, never," and distance me completely from the main character.
The I perspective, on the other hand, preserves the necessary distance between the reader and the main character. He can feel along, but is not forced to feel the same as the main character. If you're acting stupid, you can shake your head over it without feeling self-hatred.

Then I'd give you the hint to discuss the names with Harry Potter again. At the top I had already pointed out to Lestrange, but in addition it also means Gryffindor and the Knuffelmuff should probably be a small Knuddelpuff. If you write in a correct writing program (eg Word, LibreOffice, etc.), I would advise you to record the Harry Potter vocabulary in the dictionary.

Furthermore, I would advise you to tell a little more. You're running through the story. Describe more how your main character feels, where it is, etc. This also helps to show the character of your figure without having to tell about it. The reader is blind, he only has your words to imagine her life.
For example, you could write out the conversation with Hermine a little more to tell her parents died. Depending on her character, she may be sad, jealous or just rejoiced that at least Hermione had a nice holiday, etc. She could complain about the long waiting period, which was actually only five minutes long and are looking forward to returning to Hogwarts because she sees her friends and her brother there. Or she's upset about the latter because she can't stand her brother.

Then you should try not to repeat the same words so often. One example would be, "We went through the compartments and looked for a free compartment." Make it more like this:
"We went through the train and looked for a free break."
"In search of a free compartment we went through the train."
"We went through the compartments but didn't find any free."

Lastly, I would advise you to make empty lines and line breaks. You leave empty lines between individual scenes, you use the line breaks to make scenes even more readable.

I know that was really a lot of text and many points of improvement now. That doesn't mean your story is bad. I didn't have to guess what you wanted to tell me now. You're already a lot ahead of Wattpad. So your story is very legible. The problem is, potential readers do not start with you because you bury them before.

So don't let you go. Continue working on history and above all on the first impression. Be patient about readers. According to my experience, many only completed history read as they can no longer be broken down. If you don't want to publish the story at once, it helps to be reliable. That means, if you announce, I update the day x, you should also stick to it and not find an excuse every few weeks.