I am a pessimist. I see the glass as half empty, which means that I am (a) often right about things going wrong and (b) slightly less-often surprised when things go right. It’s a defensive mechanism I have, based on many bad experiences and disappointments.
But I could be a “glass-half-full” guy, if I was more like my dad. He is, indeed, more of a glass 120% full kinda guy — a bit delusional but always cheerful. (He’s also had some interesting luck.) I’m not sure I can convince myself to skip onto a more optimistic path, but it’s something I need to think about.