Never believed in Santa. My parents always told my sisters and me that they were the ones giving us the gifts, and in the days leading up to Christmas would steadily add gifts to the pile under the tree (i.e. no gifts 'miraculously' appeared Christmas morning). We also always opened gifts on Christmas Eve, so that kinda threw a wrench in the whole, "jovial, overweight man shows up Christmas Eve to deliver presents." And then, there was the whole having to visit 5 or 6 sets of relatives thing, which would have stretched thin the plausibility that said 'jovial, overweight man' would deliver presents for me at 7 different locations, if I hadn't already known that he wasn't real. Of course, I was under strict orders not to tell other kids my age what I knew, probably because my parents didn't want to have to deal with their parents after I 'traumatized' their kids.
Apparently though, not ever believing in Santa is a rarity for a Caucasian kid growing up in North America.