This might be a no-no to admit on a money message board, but I basically throw money at issues I am insecure about. It makes me feel invincible to have spent money on a great haircut or on an unlimited yoga pass or on a dress that I love and know makes me look good. And as a really extreme coping strategy, I run away to somewhere more desirable for short stints when I feel really down about something. (Although I also run away to places when I'm feeling really happy about something.)
I have overcome insecurity by getting older. The older I get the less fucks I give.
There is something magical about hitting your mid-30's. In the past few months I seriously have felt a shift in how much I worry about what others think.