Can I step down as matron of honor in a friends wedding?
That is not good. Did something happen that is causing you to step down?
Yes, I feel the bride is being controlling about what I do during the wedding.
You should not back out of this special occasion at the last moment. Instead, you should understand that your friend is stressed out and find out how you can help her. If you back out, you will ruin your friendship over a small moment in time.
I'm sick of hearing about the wedding. It's her big day, not mine.
It is her big day and she is your friend so you should be there to support her. If you back out of the wedding you might lose her friendship.