My wife and I grew up as JW's and missed out on everything. Although we continued with it well into adulthood, we both suspected that much of the restrictions we lived under were completely unnecessary. We allowed our boys to join the local youth basketball league when they were in elementary school and later the Jounior and Senior high school swim team and wrestling team. They enjoyed it immensely and benefited socially from it. Even though we had to sort of keep it on the down low and got the stink eye from different ones who knew, we ever regretted it or doubted ourselves. None of the elders dared to give us any grief about it.
Evil Monsters that we were, we also used to do something special for them on thier "birth date" even if it was only to bring them home a chocolate eclair and a little gift and give them a rundown of the events the night they were born. We allowed them to go to the Highschool Prom and our youngest Son was the Homecoming King in his Senior year.
We were jilted out of our childhoods in many ways and even though we're now free of the Watchtower's stranglehold on our personal relationship with God, we do have regrets about not having gotten out sooner but at least we can feel good that our boys didn't have their youths totally spoiled by it all.