Your quilt top looks beautiful! Do not give up. It can be very frustrating to quilt on a domestic machine. But with each quilt it brings a new experience. We expect perfection so often, but that takes a lot of practice and patience. If you continue to get really frustrated and upset, stop quilting for awhile; even try a different technique...like tying it. Have a friend come over and sit and talk with you. A friend of mine, could not stress enough...quilting is about having fun.