Withdrawing is not nearly as bad as a dismissal, but you also have to realize that ADCOMs will see this and it will be a huge red flag. What makes you think you would be able to handle medical school any differently the 2nd time around? This is not meant to be an attack on you, but merely to make you truly think about the situation and why you would want to consider trying again. You are talking about a lot of time and money that would be going into this. There are lots of other career options out there like PA or NP.