I think you've been watching too many movies, or reading too many bridal mags :) 100 people is considered a fairly large wedding.
In a comment, you said you're more worried about what others think than what you want yourself. This is actually smart thinking. Sure, you get to decide about a lot of stuff, but when brides don't think about their guests, bad stuff happens. To keep your life simple, guest surveys have been done for decades, and everybody wants the same thing: good food (and drink, if applicable) and good music. It's really that simple.
When you ask why you're like this, it's obvious! It's the biggest day of your life and you want people to enjoy themselves. Just don't bring on your own stress worrying about a non-issue. Guests will want to enjoy the festivities and catch up w/people they haven't seen in awhile.