Don't feel bad!!!! We all have a learning curve and sometimes we still make stupid errors and have to rip. And, by the way, stitching in the ditch is SO much harder than it sounds. I too would suggest a more decorative stitch, or invisible thread and just practice.
We're our own worst critics....are you quilting for fun and to give gifts made with love to family and friends or are you trying to be perfect? I suspect the former, so don't be so hard on yourself.
It will get better but we all have those days!!!! :)