I know how you feel. I spent two years making blocks for a quilt and had the same problem with them fitting. I fudged the seam allowances and added some fake sashing (same color as background) and was able to get the quilt together. Since then, I purchased a 1/4 inch foot for all my machines and a seam gauge to test as I sew. Even with all that, I still have blocks that sometimes don't work correctly. Good luck on your quilt.