I'm not sure I understood all your problems but I hear you pain. We have all been there. It's unfortunate it was so frustrating your first time out. It's a gorgeous quilt and anyone would love to have it. don't give up!! you have a good eye for color, something I sometimes struggle with and your result has to please you.
Maybe you should take a class and be able to avoid some of the beginner mistakes.
I love your quilt and salute you for sticking with it.