I would love to hear from some of you whether or not this is quite common or just something I personally experienced.
Suppressing doubt is much more common than you might think. You asked a very poignant question:
"How could I have ignored my gut feelings all of this time?" The answer is really quite simple. It is because you are a human being.
If you are like most of us, you had no choice but to ignore it. It is constantly drilled into us that we have the "truth" and that Satan uses doubt to "draw us away from Jehovah's theocratic organization". Why do you think the WTS constantly hammers into the minds of JWs to never indulge in doubts, never allow oneself to engage in "independent thinking"? Why do you think they constantly discourage the rank and file to only do Biblical research using the Society's publications? They know that even a casual investigation into areas such as archeology, geology, religious history, and ancient mythology will shoot several holes into their ideology.
This is probably why so few JWs have library cards. The public library; next to the internet, is probably the biggest enemy to the WTS system of psychological control over it's minions.
You certainly are not unique in the way you tried very hard to suppress all of your intuition, gut level feelings, and doubts. I tried to do this for some 15 years; until I just could not do it anymore.
There is a book I think is an absolute MUST READ. It is called: Combatting Cult Mind Control. It is written by Steven Hassan. When you read this book, your eyes will open, and you will understand yourself and the JW psychology so much better!
Welcome to the site, and most of all, welcome to reality.