If you want to pursue this, you should talk to a criminal defense lawyer in your area. This is a very difficult situation. By attempting to withdraw your plea, you are telling the court you lied when you entered your plea. That is a difficult thing to do, and it carries a number of risks. Before going forward with that you should consult privately with a good lawyer in your area.
This response does not create an attorney client relationship and is offered for informational purposes only. Only a lawyer fully versed on the facts and circumstances of your case can properly advise you on the case. I am licensed to practice in Minnesota, not every state. You should always consult with an attorney licensed in your area on how best to proceed.