I think it’s normal to tire of your characters after you’ve spent so much time with them. Normally, after I finish the first draft, I take a little time away from my book. That helps me go back with fresh eyes. And usually after a little while, I start to miss my characters too.
And to be perfectly honest, I think most first drafts are craptastic. I know mine are. My second and third drafts are too! 🙂 Don’t give up!
I can’t critique a whole manuscript right now, but I can take a look at your first three chapters if you’d like.