Sam Winchester's childhood had never been normal. No matter how much Dean tried to give him a sense of normalcy, it was all just an illusion. The Winchesters still moved, Sam still had to switch schools every time John finished a job.
His innocence ended at age eight. By age ten he was accompanying his father and brother on hunts to kill monsters. By twelve he was rebelling against his father. The teen years were hell for all of them, let's leave it at that.
His father condemned them before Dean was even in school. Dean was hunting as soon as Sam could stay by himself in whatever crappy motel they were paying for with fake credit cards and cash that had been hustled.
Even when he got out of hunting and went to college, Sam hadn't been normal. He still had the hunter paranoia instilled into him by his father and brother. He tried his best to ignore it but something like that just doesn't go away no matter how long you pretend it isn't there.
Then his father went missing.
Then Jess died just like his mother had.
If twenty-two year old Sam didn't know better, he would almost say it was destiny that his life was never to be normal.
Yeah, went over my 100 word count but…I think it was worth it.