The way to bridge that gap is to only volunteer predictions when you’re quite confident, and otherwise stay quiet, change the subject, or murmur a polite assent. You’re absolutely right that explicitly declaring a 65% confidence estimate will make you look indecisive—but people aren’t likely to notice that you make predictions less often than other people—they’ll be too focused on how when you do make predictions, you have an uncanny tendency to be correct...and also that you’re pleasantly modest and demure, too.
The way to bridge that gap is to only volunteer predictions when you’re quite confident, and otherwise stay quiet, change the subject, or murmur a polite assent. You’re absolutely right that explicitly declaring a 65% confidence estimate will make you look indecisive—but people aren’t likely to notice that you make predictions less often than other people—they’ll be too focused on how when you do make predictions, you have an uncanny tendency to be correct...and also that you’re pleasantly modest and demure, too.