[Disclaimer: this may help, it may not, I'm just sharing what I think might be of service to you. I'm no expert!]
I can attest that the mind will find ANY and EVERY single way that something could be true because it WANTS to discover what the DANGER is. Anxiety = danger, it's how our ancestors survived. The "possibility being a pedophile" could go against a person's values which makes all the thoughts, feelings, and sensations HORRIFIC. Understandably so, ESPECIALLY us with unnatural amounts of anxiety! Which leads to my next point:
The brain truly is a MASTER of creation...I love when it conjures up the most horrific, anxiety-inducing hypothetical scenario...it's wonderful (not)!
In all seriousness though, I can say from experience that the mind will find ANY and ALL ways to try and PROVE if something is TRUE because since the thought of something possibly being TRUE induces ANXIETY, this means there is the possibility of DANGER, which to our ancestors was a risk they couldn't take...survival came first. They provided us with this neurological wiring. Lucky us!
Our ancestors needed minds that could quickly sum up hundreds of possible scenarios so that they could prepare themselves...
...so if the thought being a pedophile is anxiety-inducing (a common fear of hundreds of THOUSANDS of folks with OCD) the mind will try to figure out where the danger is..."is it from my past? Oh was it this thing I did (or happened to me) when I was 16? Wait did that even happen? Now I need to figure that out...AH how do I prove if that happened or not?!...maybe it did because I'm feeling things?!?!?" (this is what I believe is an example of "mental gymnastics", which us OCD-havers deal with on the daily...you aren't alone).
The desire to "figure-it-out" is not unnatural, it's basic survival. But us with OCD are extremely anxious and frantic when "dangers" occur that we cannot run from or fight with (fight or flight, a remnant of our "monkey days"). So figuring-it-out becomes an endless circle. The key for me was breaking that circle a bit.
The acceptance of uncertainty helped me immensely and it got better over time. Believe me, at one point I was in a LIVING NIGHTMARE and wanted to end my life. But I tried MY very best and crawled forward, using strategies I had learned (listen to The OCD Stories Podcast...it was a blessing).
What you read on that community terrifying to read, understandably so, because those words MAY be confirming your fears. What you read about pedophiles doing mental gymnastics because of mental disorders, or not realizing that they truly are sexually attracted to children MAY or MAY NOT be true for you...because people and their neuroses (psychological problems) vary GREATLY...just because something is true for another does NOT mean it's true for you.
There's never a way to know what you really did or what really happened in the past, especially if it was a traumatic experience. The mind always tries to make sense of everything it can, and at the end of the day it comes down to letting time heal wounds and making VALUE BASED CHOICES. Things iron-out in time, the intuition speaks truths, at least from my experience.
I'm sorry for things that may have happened to you, and I tell you to try YOUR very best to practice compassion with the things you may (or may not) have done. Practice accepting uncertainty. The human mind is EXTREMELY creative...keep that in mind when you find yourself in an intrusive-thought hell-hole. I write this knowing that another human will read the message I have written with their own eyes...I don't know you, but know you are loved and you've got this.
Sorry for the long-winded response, I'm just trying my best to help. Stay strong.