People want different things. They behave differently, even under the same circumstances. People need different things. They believe differently.
Some people like to be around other people, sometimes lots of other people.
But other people like to be by themselves. Going to a party is actually draining on them. Some people seem to like making decisions and make them quickly. Others prefer to keep their options open, perhaps collecting more information before making a decision. Some people love to work from checklists.