Been masturbating since I was about 5y.o. Fully clothed, I used to open a door, hold on to the knobs w/both hands, press my cock against the wood in front of me, lift my legs and start rubbing like crazy. Shot off the first time doing something similar to this, thought i had pee'd my pants at first.

After a while i started taking off my shirt while rubbin' it (like around age 7) somehow knowing it was a manly thing to do when rubbin' your dick the way i was doing.