You are completely normal, most of us had to find the truth on our own, if anyone had tried to convince me of any of tatt, it would have just made me determined not to listen.
It's partially that the Watchtower conditioned us to fear apostates and partially simple human nature.
Studies have shown that the more people have invested in a choice, the less likely they are to listen to anything negative about it. It's seems we tend to reject anything that would make us think we made a mistake. We decide it must be a lie, or nitpick it, or find fault with their person sharing the information (bitter apostates!) That changes if we start becoming unhappy with the choice and start looking for answers on our own.
That's why it's usually futile to try and get someone to believe negative information about the Watchtower. If you tell them the Watchtower has a problem pedophiles, this creates a state of cognitive dissonance, because to believe the Watchtower knowingly did wrong means they picked the wrong religion. The idea they might have picked wrong religion is painful, so they dismiss the negative information as being unreliable.