I wish you had posted a picture. It is important to check out all your squares pieces to make sure they are all the same size before sewing them together. Don't press your fabric after you have cut the squares. That can affect the size of your squares to become wonky. As long as your cutting is accurate and your seam allowance is consistent, it should come together fine. You can always finish the top the best you can do and donate it to a charity. Someone will appreciate it.