To get an annulment, you need to prove that your marriage is either void or voidable, and that this is the reason you're asking for an annulment. You can't get an annulment just because your marriage was very short. If your marriage doesn't meet one of the criteria listed as void or voidable below, you will need to get a divorce instead.

If you weren't legally allowed to marry in the first place and the state won’t approve such a marriage, it's called a void marriage. If you weren't legally permitted to marry because of a particular problem, but the state will allow you to choose to remain married, you have a voidable marriage.