If we are wrong (and the WTBTS are right), Jehovah will soon eradicate 99,9% of the world's population, men, women, children and elderly, and a great deal who have never even heard of Jehovah. And he'll be justified in doing so, and the survivors' memories of this world will be wiped.
If we are wrong, mankind is only 6000 years old, and there was a global flood ~4000 years ago with no (real) physical evidence left behind. If we are wrong, there's no such thing as evolution.
If we are wrong, "all scriptures are inspired"; in other words, the entire Bible is inspired, which is curious, as at the time that verse was written, the 'holy texts' used and considered inspired were different from the ones comprising the Bible today.
If we are wrong, Jehovah dispenses 'new light' (or new understanding) to his only chosen channel in this special time in mankind's history, in a way that it first is right, then is wrong so he retracts it, then embellishes, then retracts, then comes up with a totally new understanding, then goes back to a previous one... etc. etc.
I'm sure I could go on and on.
-But I understand the feelings you have. I think it sneaks up on us all from time to time, although it gets better with time.