How to get over someone calling you ugly behind back?

My friend was trying to set me up with this person and I was not really sure but might have gone ahead, but just now I was looking on my friends facebook & the person is telling him that he wouldn't go near me, I'm too young (babyish), my face scares him & ive a moustache. I just feel really sh*tty now & don't know how to cheer up! Any advice?