Welcome from Pennsylvania.
You need a quarter-inch foot on your machine. Check that you have that on when you are sewing blocks. When you have your fabric laid down right and the foot edge along the fabric edge, you should get the perfect quarter inch seam.
I think it's a good idea to check your seams. If you want to do that, cut three 3-inch squares. Sew one to another. And then sew the third on the row, so you have them all sewn in a row. If your seams are a quarter-inch, your row should measure 8 inches.
Have patience with yourself, practice a lot,and sew for the fun of it. Accuracy will come. I promise.