Well thats good, its your hobby and you have nothing to be ashamed about.
I had quite a bunch of friends in school, some of them knew my hobby, others didnt, but the ones that did were always very understanding.
This hobby has its advantages where you can do cool stuff like repair the lighting in the school etc.
I used to always sit there watching the EOLs flashing away in class and the corridors!
In french lesson i used to deliberately turn the EOL fitting on so it would flash all lesson