Finish it.
I'm working on my first and deliberately ignoring all the mistakes and scrapes and ugly bits I'm causing because the only way I'll learn how it all fits together is by completing it. As Bruce suggests, make the mistakes on this one so you won't make them on the next (you'll make brand new ones!). Since it's already not quite perfect, you may as well use it for practice.
Another way to look at it is that the only way you'll arrive at a perfect (or perfect enough) guitar is through practice. A corollary is that every guitar before the perfect one will be imperfect in some way that will teach you something. And you won't arrive at the perfect guitar magically by tossing imperfect ones aside and starting over, since you won't have acquired the practice and knowledge that comes from finishing the imperfect ones. At best you'll have a bunch of unfinished imperfect guitars and no finished perfect guitar.
At least that's how I'm thinking about it for my own questionable first guitar.