The first draft of your manuscript can be rather turbulent. I get it. Really I do. When it’s finished, you look it over and think, “Uh oh, I don’t like this at all.” Two things you can do here. You can either chuck it altogether, or you can use it. Whatever you do, DON’T CHUCK IT. Why? I say this because, even if you don’t use some of it, part of it you will/can use. You can also use the whole thing but polish it up some or a lot. Only you know your story, so only you know how to fix it. In the end, you will have learned more as a writer, and your story will have grown and developed in ways you would not have imagined. If need be, walk away from it for a while. Take a break, think of other things. Then, go back to it.
I remember when I lost part of my manuscript when I was transferring if from my desktop to my new laptop. I was blindsided and distraught. I put the whole thing down and vowed I wouldn’t go back to it. Eventually, I did go back to it, and I made it better. The ideas flowed, big changes were made, and the story became more clear as it relates to where I wanted to go with it. So something bad can turn into a blessing if you let it.