My advice would be to postpone the wedding because you have a legitimate excuse and then try to go to pre-marital counseling or even just a marriage prep course. Your FI is your best friend and you should be able to discuss your insecurities with him and not worry about the outcome. I've seen a lot of people get married because it is the next logical step, and then go on to have children for the same reason. Sometimes it works out, other times they feel an obligation to stay together. Everyone deserves happiness and you should do all you can to ensure that in 40 years you still have the desire to share intimacy with your husband, even if that intimacy is just holding hands. We all deserve love, no matter when in our lives it comes along.