Relationship intimacy

I am engaged to a man who has a physical problem and therefore sex has been mostly work than fun. He agreed to get seen by the doctor. We don’t know if it’s treatable yet. I feel a lot of shame in this situation. Shame for postponing the wedding until there is diagnosis or more information. It seems to be a conditional love to me. Am I not the person who sticks through thick and thin? However, I cannot imagine a happy connected relationship without sex, we are both very young. Another thought that is killing me is that while trying to figure this out, he expressed several times that he is doing it for me. So I can have what I so want. What I make it mean is that it is not a great take on intimacy and I don’t want to be shamed for enjoying it…. help!!!!!