You've gotten some great advice so far, so I'll add this: "Son, you're right when you ask why didn't we learn TTATT sooner, but have you ever considered what your life would be like if we STILL thought it was "the Truth" like so many others?"
"We figured it out when we figured it out. Yes, it could have been sooner, but it also could have been later or never at all."
"As for your life being 'ruined,' you're really be a bit of a drama queen."