Great advice...... don't watch the needle....watch the fabric.
I have really struggled with my quarter inch seam also. AND I STILL DO. I have a 1/4 in foot...... but here's what helped me the most. The lines on a 3 x 5 card are exactly 1/4 inch apart. So if you put a card under your needle.... and sew an inch or two along the line nearest the edge.... that edge will be where your fabric should be for you to get a 1/4 inch seam. Then take a strip of blue (or black) tape and mark the exact place where your fabric should be. I hope that makes sense to you, honey. And as the others said... don't get discouraged. I called a good friend and whined about my seams and she said.... "just be consistent.... you want quarter inch but if all of your seams are consistent ... your quilt blocks will fit together."