yep - it can still be abuse even if the perp is the same age. the required factor is that there must be a significant difference in power between the perp and victim - in size, strength, authority, age, number (as in a group,) status, or experience. sounds like you qualify on the "experience" factor.
i experienced abuse that fit each of the above categories, but for years i denied that the same-age experiences were abuse. first i just called it bullying - because it involved a group and most of them were my age or only a little older. (like you, some of this was in a Scouting context.) but it looked like abuse and sounded like abuse and felt like abuse and its effects were the same as the actions of older, bigger, stronger, authoritative adults - that i knew were abusive. eventually i had to face that.
you might have some competition here for your title of "Dissociative King of the World." lots of guys here can relate to that.
anyway - well done, starting to tell your story. hope you'll get the kind of support and encouragement that i have found here. PM me any time if you want to trade war stories and aren't ready for the mass audience.
How long, LORD, must I call for help, but you do not listen?
Or cry out to you, “Violence!” but you do not save?
Why do you make me look at injustice?
Why do you tolerate wrongdoing?...
Therefore the law is paralyzed, and justice never prevails....