You may dislike change.
This could be a change of seating plan, a new member of the class, a different teacher, a different teaching room, change of timetable, changes at home, different rules, moving to a new school, staying away from home for the first time – or just a change of plan in general.
Thought might be:
‘I can’t predict what will happen. I don’t know what’s ahead. What if I don’t like it? I like it how it is.’
or maybe ‘ Everything that was certain is now uncertain – now I feel out of control .’