Keep at it, you will improve and don't worry about those seams. Almost all of us have a quilt in our past that resembles yours! I have been seriously quilting for about 5 years, and the first big quilt I did fell apart at the seams. The whole thing! I didn't have a clue about 1/4 seam allowance and was sewing my seams too narrow. After I washed it, it all fell apart. I took it all apart and salvaged what I could and the batting.
Now, I am doing so much better. So will you. Gina