When I was in first grade I didn't believe in Santa but my classmates told me that if I didn't I wouldn't get any presents so I automatically started believing in him and I still sorta do to this day. (though the belief is sorta fading. Kinda tired of going to bed at nine every Christmas due to that belief.)
A childhood belief about father christmas

others believed things like this
- when i was little i thought that jesus delivered presents on christmas not santa .— gaby
- I was told that for every christmas carol i sang before christmas time santa would give me one less present!— K
- when i was a child,i used to believe that Santa claus drove a car and all the presents were in the boot— narration
- My mother told me when i was 5 that Santa wouldn't come if i kept sucking my thumb. — Traumatized
- I used to belief sloths lived in trees outside my childhood home. My older sister told me so.Anon
- I used to believe that at Christmas if your house never had a chimney then santa came through your letter box— Rhys James