Good stuff here, so I don't have much to add. Penelope, welcome. You are smart to come here. Despite what ConcernedJW says, most of what you hear on this site is NOT hearsay but first hand primary evidence from people who gave a significant portion of their lives to the WT. As someone who was raised by former missionary parents and spent several years pioneering, I will join in the chorus and suggest that you tie on your running shoes...
As far as "JWs never claimed they are perfect," I just want to add one simple thing. It doesn't matter. That can't be used as a rhetorical safety hatch, as if it somehow excuses all their failed predictions and wrong interpretations. Rather, when the WT makes a statement, prediction or interpretation, it presents it, not as the best guess of imperfect men but as coming from God--"food at the proper time," "dining at God's table," provisions from Jehovah, direction from his "spirited-anointed" / "spirit-directed" / "spirit-led" organization (I'm sure you've heard one or more of those phrases already) and as something that is ABSOLUTELY CORRECT AT THE TIME. They even use the phrase "present truth" to describe current beliefs, while paradoxically clinging to the ontological stance that truth is absolute. There is no option as to whether you as a JW will agree, accept or obey. You will, because otherwise it is the same as DISOBEYING JEHOVAH. These two situations are presented as equivalent.
The WT organization assumes divine authority when dispensing information but shirks it under the disclaimer "we never said we were perfect" when it turns out they are wrong. And, in my opinion, that stinks.