I always thought my jaw line was manly. I have this pockmark on my chin from when I was 9. I used to get freaked out about it because people thought it was a pimple. But those are the things I've become really comfortable with as I've gotten older. My scars.
What convinces is conviction. Believe in the argument you're advancing. If you don't you're as good as dead. The other person will sense that something isn't there, and no chain of reasoning, no matter how logical or elegant or brilliant, will win your case for you.

