I was in a car accident when i was 14, my mother settled with the insurance for a small amount. I am now 18 can the case be reopened.

It depends.  Insurance companies in Virginia can require that a minor's settlement be court approved.  If the matter was court approved, you will not be able to reopen the matter.  If there was no court approval of the settlement then you might be able to reopen the matter.  Check with your mother, the insurance company or your attorney (assuming your mother used one) to determine whether the settlement was approved by a judge.  On another note, your mother should have protected the settlement proceeds for your benefit until you reach age 18.