There is no alternative for a young JW (or even an older one.)
Living a lie is what being a JW inevitibly becomes for one very good reason.
JW's do not live in the actual real world. Instead, they live in a fantasy.
When the fantasy bubble is popped by any intrusions by the real world the whole fantasy collapses for a moment.
To live in the beautiful fantasy requires some extreme repair work and revision of thought.
You learn to compartmentalize. To maintain the fantasy bubble you must keep the illusion in one compartment and your real self in another.
When you visit with JW bros. and sisters you put on the fantasy personality. When you are with real people in the real world your actual self emerges.
You become, in essence, TWO people!
This sounds crazy, doesn't it? But, you are being MADE CRAZY by living in the false world of Jehovah and his Watchtower buddies in the first place.
What if you did NOT do what I am describing above?
You'd simply have no life at all. Not for very long. You'd bleed to death from the absence of contact with reality. You'd become depressed, lonely, diminished in intellect. You'd have no outlet for healthy emotions. You'd keep your eye on the horizon for a dot that never appeared. You'd be rooted in one spot and the immobility would anchor you to a non-productive life of inertia that would rust you and crumble your spirit.
That is why the DOUBLE LIFE is so necessary.
JW kids don't want to lose their family; but, they simply must live in a REAL world from time to time.
Hence, the lie.
I suspect all JW's have this binary personality disorder. It is cognitive dissonance in the extreme.
They may even suspect it is happening; but, they can NEVER CONFRONT the truth of it.
I also suspect many act out in order to be disfellowshipped so that they are forced to face reality without much prospect of returning to the life of the illusion and the lie.
But, I'm no psychiatrist.
Terry