Luna, you're going to do whatever you want to do. You have over 30 responses here with other member's experiences. If that isn't enough to convince you to at least postpone the wedding, nothing else we say will.
I wish you every happiness, but I really hope you will keep re-reading these responses to your situation. We have nothing to gain by warning you of what your future will very probably look like if you go ahead and marry this guy, but you do.
P.S. to add: After reading your last post, it really doesn't sound like either one of you are ready to be married at this point. I hope you both get the help you need.