As far as what it was like for JW kids in the past, you really summed it all up really well. I too often wonder if I did this well after growing up in a Cult-like religion, where would I'd be if I had spent as much time in activities that would have not only have given me more employment choices but also made me a more rounded person and would have enriched my life.
My twenty something son is almost done with his Degree but laments at how behind he is experience wise as well as socially compared to his contemporaries and my wife and I feel badly for not having awakened long before we did and possibly sparing him this problem.
Like any of the experiences we have in life we can extract good and bad aspects from them and make the best of things....play the had your dealt. Even those in Nazi concentration camps must have come away from the experience with some skill that would give them an edge in the rest of their life. (strength, endurance, appreciation etc) . Even so, there are plenty of better and more pleasant ways for them to have acquired those particular skill and for us to have acquired the ones we may have gotten from being JW's.
As a former JW, you can choose to regret your past and lament the lost time or look for the positive aspects about your experience and play them up in your current life. With both of those choices, you are still a former JW but with one of them you get to feel a whole lot better about things.