As Mariah wisely says that, while some marriages will survive, there are risks that trying to achieve one outcome might have to come at the expense of another that is equally important. That you are going to joint therapy I think is a positive sign; that other person should act indirectly as a moderator and hopefully encourage 'negotiations' rather than 'entrench' positions.
Everyone deserves to be happy and true to themselves..... You are faced with dilemmas, which way to turn, to have 'this', but not 'that'. You should remember that your life, and how you lead it, is just as important and valuable as anyone else's when decisions are made. Changing the scripts of life away from the conventional, 'heteronormative' is far from easy..... so I wish you well, understanding all too well why you feel afraid..... However, while your circumstances, like each one of us, are unique, there is lots of empathy here from experience of similar paths being travelled. Welcome and hugs from another newbie!! xx