The first condition for a Hindu marriage under Sec.5 of the Hindu Marriage Act, 1955 is that neither party has a spouse living at the time of the marriage and violation of this condition either by the male or female would render such marriage as a nullity. Marriage took place between you and another female during the subsistence of first Constitutes contravention of the condition specified under Sec.5 (i) nd thus becomes null and void under Sec.11 of the Act and annulled by a decree of nullity by the Court under Sec.12.
You must also know that contracting a marriage which is void invites a punishment for bigamy under Sec.494 and 495 of the Indian Penal Code. Of course, the Statute has taken care of the children born out of such illegal marriages and Sec.16 gives the status of legitimacy to a child born out of a marriage though it is null and void.
you are advised to contact a lawyer in person, instead of opening the issue for general debate and advice, and seek a proper legal remedy for seeking a divorce from your wife. The female who married you during the subsistence of her married life has committed a double crime and she cannot be treated as your wife, and there is no such term as second wife which can be used in your case.
trinath reddy k