Kids shared changing room?

When i was young, abt 9 years old, i attended swimming lessons held by the sch. After the swimming lesson, our teacher will tell all of us to go to the kids changing room which was shared between boy and girls. The thing is that there were only 15 cubicles and the cl was 30 students. So, the rest of them had to change outside. It really bothered me back then when i see some of the boys and girls naked outside. Will it affect them for a 9 year old?