It could be low self esteem. I find it hard sometimes to finish or start something because I doubt myself. It is a lot harder when you've been told you can't do something all your life, those little voices are hard to ignore. Just keep pushing forward, even small steps move you forward. Don't talk yourself out of finishing your quilts, they'll turn out just fine. Right now I'm looking at a quilt that I need to finish the binding, scary stuff, I hid it in my cabinet months ago, but today I will finish it. (Or as soon as I get sick of looking at it laying on by sewing table.)