The Non- Existant

Vincent has never not been worrisome of the next day, because since he can remember most days when he wakes up he faces death. He has no answers to why he wakes up in different deadly senarios not one the same unless. He never once failed a senario before. He never had one set of parents only different teachers that taught him how to survive since untill he was 7 and had to do it alone. Only one life has come and go the life where he has a name "Vincent" the life where he has Atlena his only friend who he would die for. Vincent doesn't know if the ones he meets exist or if its simulated to teach him...something. Is he the only one like this, Is Atlena real, Why is he like this, Why don't the senarios exist for more then a day?