First of all, congratulations, man!
As far as legally, in the event you get married in a more liberal state, under the Full Faith and Credit clause of the Constitution, if a legal document is recognized in the court of one state, it must be recognized in the courts of all of them. So, even if the courts of Texas do not recognize you as male (which they should, because, again, Full Faith and Credit clause), and recognize your marriage as one between two women, your marriage is still legal, because your marriage license is recognized in the state you were married in.