You find it enjoyable to be with people you like all the time. Other people don't and reach a point where it becomes uncomfortable to continue. It's not becaus

You find it enjoyable to be with people you like all the time. Other people don't and reach a point where it becomes uncomfortable to continue. It's not because of some weird attitude about wasting energy on having a good time. Quite the opposite; once you reach your limit, it becomes wasting mental energy on not having a good time.