Considering how I always regretted not going as far in my university studies (I stopped at an Associates degree specifically because of college being discouraged in the cult), it feels like one big missed opportunity. I didn't leave until I was nearly 30 (born-in). Now, I'm back in school working on my B.Sc. degree. I regret that I haven't finished, or even started, my MS and/or PhD by now. Being a JW has been a lost decade educationally for me. Additionally, I resent the suppression of my intellectual curiosity and critical thinking that I was subjected to.
It wasn't all bad, that's true, but looking for a silver lining in a cult is like asking Andy Dufresne how he felt about the nearly 20 years he wasted as an innocent person in the Shawshank State Prison. Sure he made a good friend and had a few laughs now and then, but after literally crawling thru a mile of shit he couldn't have been happier to have gotten the hell out.