點先可以腱決呢個問題

玩插春 is very popular during puberty of young man,
because it is a way to show curiosity of male growth.
It is very normal in psychology.
You are ashame because you know that it is not proper to do this in school
and in front of female classmate. It is also a very positive way of thinking it.
玩插春 is just a way, young boy to young boy show curiosity, and they will start to realize the size of their JJ and the changes of their JJ or YuenYuen...
I would not recommend you to continue this in school. Since it can be quite sensitive for school managment to see it. And if some female teacher or classmate report this to your school management.
It will create troubles...
If you ask if it is normal, I say it is. But is it normal to do this in school I say NO
hope all help