I know this is extremely unlikely to ever happen in any circumstance, but imagine this scenario...
One day, you wake up and find that you are not in your bed, nor in your room in your own house. You then find out that your parents (if you still live with them) are not your birth parents, but are two completely different people. You ask and take a look around and also find out that you are now in a completely different country altogether. Your 'parents' scoff at your explanations that they are not your real parents, saying that you're telling fairy stories and claiming that you have been living with them since the day you were born. The same thing goes for the people around you, claiming that they have known you for a very long time, asking what's the matter with you, are you okay, etc. Along the way, you also learn that you have a different name and a completely different identity.
What would be your reaction to this particularly confusing and stressful situation? What would you do and how would you try to adjust to this situation? Would you try to act like nothing actually happened and try living a life of a person you never were? Would you try to find a way to revert back to your previous life and identity? What if you found out that this was permanent?
My mind sometimes has a tendency to suddenly get extra active and random stuff pours out lol