How to work out a marriage not built on honesty from the beginning?

All i can say to you is good luck. If you do not have trust then you have nothing. I've been in to the same situation before and I can tell you that will never change. thats the way he is and you can not change him. Unless you accept the fact that he has a whole another world that you dont know and he wont share with you. You can try marriage counseling and meanwhile HOLD off having a baby. I dont think you are going to get far with a guy like that....