Never give up! Just accept your work as it is. If I only did perfect quilts, I would never have finished even one! In fact, two of my 'best' quilts were a result of gross cutting errors - which meant an immediate change of plans.
Put a border on the doll quilt (if you think it is too small) and finish it up. Whoever it is intended for will love it just because you made it. That is what makes anything we make perfect!