Yanbu to not want to go.
I have only been to two good weddings and I am forty now! Those were weddings where the thought had gone into the guests comfort, so venue and church distance, thought in the table placings, refreshments at decent times, no hanging around in the cold, plenty of entertainment and warm parents who went put of their way to introduce different people and get a nice friendly atmosphere.
I find some of them a bit attention seeking, especially big white dresses on 45 year old bridezillas, who sit in a throne at the top table and whose father cries at losing his daughter. (at 45 and living in the next town).
I really wouldn't have gone to that but it was my male best friends of 22 years' wedding, so wanted to show face but don't get on with the wife so made that the goodbye do, wished them well and moved on....
But yes if you don't like them, don't go and sit there with a cats bumface for the day, just do something else instead.
I disagree that no one will be offended if you don't go, I turned down the invite to my mates wedding initially, and he called up and had a go at me for not being there, apparently not having childcare, or grandparents for a no kids wedding was no excuse!