I agree with everyone so far.... Don't quit. You need to work on some easy stuff... build confidence... find out those shortcuts experienced quilters use by taking some classes or joining a quilt guild.
I learned a TON when I took a beginner class with my nephew. We went so he could get some lessons and I ended up learning many, many new techniques that have made my quilting much better.
And - evey quilt I make gets better and better.