I use a fake id to get married but only my dob is fake..is my marriage valid??

If you misrepresented who you were to your spouse you marriage is still valid but it may be subject to an action for an annulment. It is not automatically void. NY allows the dissolution of marriages by 1) divorce 2) annulment 3) Legal separation 4) void ab initio (from the very beginning. You have not stated how old you are. But from the brief information you have given, your marriage could be made voidable if your spouse sought to challenge it in court to obtain an annulment. You should consult a lawyer to determine how this may effect your right.

Your marriage is valid until it is judicially declared to be invalid. But it would seem to be subject to attack on the basis of fraud.