I understand that everyone is different, and that there is no right or wrong. But, am I being unreasonable to suggest that it is perfectly normal, by the age of circa 13 to 16, dependent on the individual, to NOT want to go on holiday with your parents / siblings ever again?
You ARE being unreasonable - people who hit adolescence and want to avoid holidays with their parents are weirdos or anti-social (or are victims of deeply abusive families).
You ARE NOT being unreasonable - it is perfectly normal to hit adolescence and want to live your own life with your own friends and not be forced to spend a week or two solid with your parents or siblings ever again.