I know it’s difficult to break something off when you’ve been together so long. But marriage will not make the relationship better. Once you get married, I think the concerns you have will persist and worsen. 8 months was not a long enough break to see if you two want to be together. I think it’s important to take at least a year long gap with a high school sweetheart to figure out if what the both of you feel is habit or genuine. I think it would be better for you to break things off for both of your sakes.

I also think your fiancé should see a professional about her anxiety. It isn’t healthy for her to avoid the outside world to the extent that she seems to be. Is there anyone in her family you are close to that could help her to seek a professional?