A childhood belief about father christmas

I used to think Santa was real but my friends in junior school told me he's not real because they don't get presents from Santa (it turns out my friends' parents don't bother lies about Santa, they just give them presents to their face). I told my mum this, and she said that in order to get presents from Santa your parents have to register with Santa who lives in Finland when you are a baby so Santa would come by and drop your presents every year. To convince me this is true, my mum wrote a letter with Finnish spelling mistakes. But of course the truth became more and more obvious when the present from my mum and present from santa have exactly the same wrapping paper. One Christmas I stayed up all night and saw my mum placing a gift next to my bed. I still pretend I don't know Santa is fake so I could still get a tiny bit of excitment when it's the night of 24th of decemeber.