Are you using My skill?
Pro tip: take the Madden test and fudge the running game part on purpose (run OB on a few test plays) then do everything else to your best ability. You want rushing low until you get the hang of it. you can even practice the tests in virtual trainer
Make sure you then select My Skill as the desired difficulty level and play about 5 games and it will adjust the difficulty level pretty well to your actual skill. also go to practice mode and practice running the ball, not using sprint except to make the corner and using the break tackle moves when being wrapped by tackler. (Rt stick or buttons depending on iof the back is elusive or power)
good luck.