I think the seeds of my doubt were planted not too long after I started college. (no doubt a detail that would be used to further scare current JWs away from pursuing such an education.) I took public speaking in which we had to write two speeches, for my first speech I decided I would write about the persecution faced by Jehovah's Witnesses, however, we were supposed to vary our sources so I tried going outside the WT to find accounts of this persecution. Discovering the fact that JWs didn't have things quite as bad in Nazi Germany as I had been led to believe, and that Rutherford actually wrote letters to Hitler saying that they shared common interests...
Well, those things shook me, so I looked a little further into Rutherford and discovered the more despotic and hypocritical parts of his personality that my WT education had failed to mention. I suppose fear kept me from digging much deeper, for I was treading dangerously close to "apostate" sites and didn't want to be "infected" by their way of thinking. So I quickly finished my speech using the bare minimum of sources and halted any further research, meanwhile, I did my best to rationalize the troubling details I had discovered. Those things laid dormant in my mind for awhile, because not too long after my first semester at college I met a JW girl through Instagram.
What followed was a largely clandestine, long-distance relationship, which, suffice to say, got messy by the end. I won't go into gory detail but not longer after that relationship ended I was disfellowshipped, done in my own guilty conscience that led me to report myself, though I think part of me just didn't want it to bite me in the butt 5-10 years down the line, better to get out in front of it. I did my best to bear my "discipline" with strength and integrity, but my forced solitude gave me time to think and research... and that eventually led me here.