You don't necessarily need to rip it up. I like your attitude of trying to learn from your mistakes, that is how I learned what I know today about quilting. Take a small ruler and find out where you went wrong. Are your blocks an 1/8" too small?? Check you seam allowance. Remember when you press a seam to one side you lose just a bit with the hump of the seams. Then I would check your cutting. I wish I could show you but a frend taught me where to put the line on the Omnigrid ruler.
I gave up quilting for over a year being disable with poor motor skills that I could not quilt any loner. What I use to compensate is to cut my strips 1/8" wider. It is amazing how many blocks you can press and starch at the end and then trim down. I learned this from Eleanor Burns. So I have been quilting for an additional 8 years. I try my best to avoid bias edges and triangles.