Let yourself become connected to a person, activity or an attitude that has made you uncomfortable. Open yourself to someone you’d thought was misled, see a movie you’d thought was merely childish, start a hobby you think belongs to the opposite gender, check out a book you think is “off‑limits.” For example: if you're a guy, try knitting; ladies, let yourself learn how to change a tire.
Attitude is everything, however; break down a prison-wall for the adventure of it; embarassment or vindication makes it useless.