I am worried as well. You and your fiance are in disagreement about something very fundamental to your relationship. From your description, it sounds like the way you keep peace is by burying your own feelings. You are choosing to hurt yourself instead of hurting him or your parents.
You may be able to sustain this. But I ask you to think about whether you can do so for the next 40 or more years. Marrying him will mean accepting his point of view for the rest of your life. If you can’t imagine doing that, you will probably become increasingly resentful and angry — which will make both of you very unhappy in your marriage.
Please consider whether it might be better to hurt his feelings now when you are both young and can move on to someone else. Otherwise, you may be setting both of you up for tremendous hurt later.
I wish you well.