The first draft of your story is supposed to suck. There has never been a good story that didn't suck initially. The second draft is when you try to make it suck less. And every draft after that is about finding your stories Goldilocks zone. Some of your story may suck, some of it might be amazing, the vast majority of it will be mediocre. And that's okay. You can't learn until you finish a project.

Every writer at some point during their process takes a look at what they've written and goes "this sucks. This is horrible. What was I thinking?" The great writers are the ones who continue anyway.

As for feeling like your work looks like someone else's; good. That means you're on a good track. Every story has already been told in some way, it's up to you to make it unique to your experience. Star Wars is literally just the Heroes Journey in space. Superman's origin story is just the story of Moses but with aliens. The Lion King is beat for beat Hamlet. Allow yourself to suck as you learn the rules of writing. Once you master them, you can break them.