Please understand that I actively detest McDonalds. I never ever willingly eat there. However, I must admit that I am taken aback by the idea of never having eaten at one.
McDonalds is such a ubiquitous element of our culture. It's almost like saying you've never listened to rock music, never had an alcoholic drink, never smoked a cigarette. It's not that these are necessarily good or healthy things to do, it's just that they are almost universal.
On further review and noticing that your location is UK (presumably this stands for the United Kingdom and not the University of Kentucky (Go Big Blue!)) this is somewhat more understandable.
I'm not really condemning you for not having eaten at a McDonalds. I suppose I'm just suggesting that you have missed an important, if negative, element of modern culture by not having this experience.