I'm sure your quilts aren not nearly as bad as you think they are. In fact, I am sure they are lovely. You should post some pictures. I am sure others will tell you that you have done a great job.
Just finishing a quilt is a huge accomplishment that you should be proud of! Even a simple pattern requires a lot of time and effort.
Don't worry about what others do. Admire their work, but don't compare yourself. That's like comparing apples and oranges. Everyone had to start somewhere.
Just keep practicing, you will gain more confidence with each quilt you complete. :)