Many moons ago, my MIL attempted to push me into a wedding that I didn't want, and I resisted her efforts. I've never been sorry for standing up for myself, although I do fear it set the tone for our relationship for the past 17 years. Have a discussion with your psychiatrist about all this, and believe in yourself. It's your wedding, and your marriage. Work it out so your sweetie and you are comfortable with the final result. Everyone else matters, but not nearly so much as the two of you. Hang in there!