Well i once fapped on the bathrooms in middle school, but that was when i discovered mastubartion.
Also, there were like 3 girls i seriously wanted to fuck. On math class, since the 4 of us always sat on the back of the room, i always tried feeling her leg slowly without her noticing. Of course she ended noticing it, but she actually found it cute somwhow, and that didnt hurt how she saw me (I mean it, i seriously want to fuck her even now).
And finally, back then i always tried to feel my big sister breasts when she was distracted, and never got caught (Today i dont really care much about her anymore).