I took a class once and the teacher showed us some of her early work. We all ooh'd and ah'd over them and were so impressed and thinking like you. We thought we could never get that good. Then she told us to come close and inspect it while she pointed out all her errors. Wow. What an eye opener. She started out the same as the rest of us. Keep on heading for the finish line. You will be surprised at what a difference there is when the quilt is completed. Some of those minor mistakes will be forgotten. Even photos of quilts in the magazines have errors.
You'll improve. Just have fun. That's the real reason most of us quilt.