Do you realize that you are just on the other side of the judgement now, but judgement is still involved? Granted, there is a LOT more to do on the other side of the JW fence, but that basic mind set is the same, you're just on the other side of it.
Now don't get me wrong, I'm all for pursuing your calling and such, and I also recognize what might have been accomplished in the time that I was in. (I'm 30 now btw) But the funny thing is, if you just write it off as a waste, it will be a waste. On the other hand, if you get into even the details of those years and get something from it, then it wasn't a waste. Again, it is from a certain perspective of judgement, that being what a typically good life should be, that it would be considered a waste. But one thing I've found is that experience contributed to being what I'd call a true human being. I may not have accomplished a whole lot or have a nice career, but I know how to be and treat people now in a way that you really connect. Big Tex mentioned turning a negative into a positive - but I say that's not even a change from a bad past into a good future, it's just how you process what you already have. There's no telling where we'd be if we were never JWs, MAYBE we'd be doing what we wanted to do, but maybe we wouldn't have the same drive as we do now that we appreciate what we've been missing. Whatever has happend in your life, it got you here. And if you now know what you want to do with your life, that's more than what a lot of people can say.