What were you absolutely certain about when you were younger that you no longer believe?

When I was young and broke I was pretty darn sure that as soon as I could afford a house and a car I was going to be happier then a pig in slop. I had my halcyon days with plenty of money and stuff, don’t have it anymore, happier now then ever before, and no longer believe with things and money comes happiness. What did you know for sure when you were younger that you no longer believe?

I am talking about things other than God or anything that has to do with religion or theology or anything that will set off another Fluther Religion Thread. Also, I am not referring to no longer believing in things such as Santa Claus and the tooth fairy.