Like many, I wouldn't say "ruined" but certainly manipulated and influenced for both better and worse. There certainly are worse lots in life. However, there were many lost opportunities, happy occassions as well as cutting off of family and friends as a result of being both in and out of Jehovah's Witnesses. But then again, who knows how things would have evolved without it.
Anyhow, I am extremely happy and grateful that my wife and me are out. Thankfully, her parents have joined us, and sadly my parents and siblings have not and as indoctrinated by the Watchtower Society are shunning us (My father was talking to us for a whlie but I think the pressure and choices between talking to us and dealing with all the aggrivation and issues or not talking to us and continue coping with the rest of the family in the cult has become too much).
To sum up, no it wasn't ruined but definitely manipulated and controlled, leaving life-long scars and damage.
-Trebor