How do guys know they are handsome?

Anonymous
Some guys say, "I'm really handsome/good-looking, if only I could get better with talking to girls or making moves..."

How do you know you're good-looking? Even though I've been told that I am from time to time, girls don't seem very interested from just looking at me.
Updates
+1 y
Thanks to everybody for the responses, I read and appreciate every single one. Always room for more opinions and commentary.
Updates
+1 y
Background: I've been told I'm good looking or "cute" a handful of times in my life...but ONLY a handful of times. I'm usually passed up for other guys with a bigger personality. Girls just don't like me that much. Then again, I don't get out much...
How do guys know they are handsome?
41 Opinion