I've been out roughly 15 years after spending my entire life in it.
It's hard to overstate how ingrained the programming becomes. Growing up in the cult leaves behind a legacy that can take a lifetime to overcome.
When we're children, we take in lessons from our upbringing and connections get formed in the brain that condition us to react in certain ways to specific stimuli. We process this as fight-or-flight reactions to situations that might break certain JW rules, like being at a party with worldly people or being in an intimate situation with someone other than your spouse. These are situations that "worldly" people view as normal.
When we leave, we don't wipe the slate clean. The programming is still there. You have to actively train yourself to overcome it and it takes years. It can be accomplished, though. I remember being at parties in my late twenties full of anxiety even though I hadn't been a believer in two or three years. After many such parties, the anxiety eventually went away.
Best of luck to you.