i dont think i would have listened to very strong anti jw stuff at that age, i was soooooo indoctrinated,
i think that the main thing i could have said to myself would be:
love those that are very close to you as if you could lose them tomorrow, cos you will be losing them within the next 2 years, so make every second count and have fun and laugh with them and hug them and cherish them and smell them and look at them and hear them, because you cant get those moments back, and they will go and you will lose them and there will be nothing you can do about it,
make some memories with them that will etch upon your heart,
ask them important questions and try to find out their opinions on what really matters,
so in the years to come you can remember their answers, and although they will be gone you will have those words to remember
also, to the 20 year oldme, OBSERVE, look around you and REALLY notice what is going on, dont take anything as it appears, think deeper and out side the box you dont realise you are in,