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I have another mental tool in place for that. It's a trick of logic stolen from Buddhism: "This universe may be pointless, but being part of the universe, I am the universe, and look at how absurd I am, and how many silly manifestations I have. I'm throwing things at myself in order to scare and amuse myself; in order to trick myself into thinking that any of this really matters. I'm going to silence this silly meat lump that I call my brain, and just take it all in. The past and the future don't exist. There is only the now. Who cares? Have a blast!"

If you're not in the habit of thinking like that, it probably sounds like a bunch of mumbo-jumbo, but I find that it helps me feel all right.