If I compare my life with my 6 other close friends (non-JW's), my life turned out 10 times better than them, despite my JW upbringing.
My mother was a strict disciplinarian (even before becoming a JW) and that helped us to excel in everything we did. We didn't go to a university or dated girls but still did well in our business and in our marriage, mostly due to our parent's values. Even during adversities, they worked harder rather than blaming anyone. Guess that helped us a lot.
My mom always taught us not to look back on lost opportunities. You never know if your life would have been worse if you have taken up that opportunity.
Some JW's in my congregation didn't have a successful life and went from one dramatic situation to another and always had someone in the congregation to blame. But it was mostly due to their own habits and choices. They would have been that way no matter what religion they belonged to.