The fact that your parents used to live in Virginia is not relevant unless they hold jobs (typically in the military or government) that might allow them to retain a state residency in the U.S. Presumably, if this is the case, you would have said so.
In order for you to become a Virginia resident, you would have to not only reside in Virginia for a full year prior to enrolling in college, but you would also have to be financially independent of your parents. You would have to prove that you are completely self-supporting. The State of Virginia will need “clear and convincing evidence" that you have no financial ties to your parents. In such situations, the decision-makers for the state tend to be very wary and will look carefully to determine your source(s) of income.