@smut4u2 Hey there, thanks for reaching out. I read through the 3 chapters I see on your page. I think the main pieces of advice I'd give is to slow down, expand important scenes, and read lots.
By "slowing down" I mean describe the room, the hall, the character-specific item of clothing, the way someone looks at someone else, or any other detail to ground the scene for the reader.
For an example of expanding scenes I'd look at the end of the second chapter. The main character makes a lot of choices that have consequences in the story (getting drunk, hitting on his friend, trying to kiss his mom's boyfriend), and there is a lot of drama and story that can come out of that but it's over in just a paragraph. This is partly because you're writing in first person, so he doesn't remember everything and it's very quick, but even in first person you can take some time to build the scene with his inner thoughts along the way and show the audience more.
Reading is really the most important thing. Go back to your favourite book and really analyze a few pages or a chapter. Look at how many paragraphs are just description, how characters' thoughts are included or not, how dialogue is broken up, and how the story progresses in every scene. You may be surprised at just how much text seems to fly by while your reading it casually.
Hope that helps! Keep writing!
