What is something you are certain you'll never experience?

Marriage. And no, I'm not actively avoiding that. At least not on purpose. I have some difficulty imagining how anyone could ever want me enough to the extent where they'd want to marry me. It feels like a pipe dream whenever I allow myself to think about that too much. I mean, I know that statistically speaking it is almost certain I will get married someday but I have a long history of beating the odds, especially when it comes to odds I don't want to beat.