Hi Janie,
I had a close friend go through a similar situation. She was a "non-churchy" Christian - an artist (dancer) with a high degree of commitment to continuing her creative work, when she fell in love with a man who had a pastoral calling.
When they married, initially she felt some friction around what she assumed was expected of her, versus what she was willing to change about herself to conform. But over time she found ways to be involved without compromising who she was. She sang in choir and led creative movement play time in the children's rooms. Ultimately she came to enjoy her role - on her own terms.
I certainly understand your concern - when you are the "preacher's wife," there is sort of a figurehead role you seem to inherit, which can have its share of demands and even baggage that you may not want to take on.
Maybe you could find ways to be involved that are less social-centric - office administration comes to mind. Some churches have a reading/media library that require some monitoring and upkeep. Also, many churches offer a contemplative path for parishioners (meditative services, retreats), which are less focused on social interaction, and might be a more comfortable setting for you.
So yes, you may need to be involved to some degree in order to provide the support your husband will need, when he takes on such a responsible role. But churches can be as multi-faceted as the people that make them up, and hopefully you can hand-select activities that will allow you to feel you are fulfilling your role without trying to pretend you are someone you are not.
HTH,
Kristina