Dancing is a product of human brain rewarding pattern recognition, if it helps you make sense of it. Kinda like music and poetry - “hey I recognize repeating sounds and language structures”, dancing is “hey, I move together with repeating sounds”. There are also aspects like trying to make movements aesthetically pleasing, physically challenging, moving together in sync with other people and so on. Clubbing is a related activity, but more of a social one. Some people enjoy being together with other people and being able to let loose. They speak with their bodies as they move in rhythm with the music. Not my thing either, but it is possible to understand those who enjoy this activity.