Am i ugly because of my parents?

Some people say stuff like "beauty is in the eye of the beholder" but to everyone's eyes I'm ugly(even to my families) I heard that if you marry a man you don't love you will get an ugly child. Well that happened to my mum and dad, my mum only married my dad for his money and cheats on him when she is in a different country and i am 13. so is it true?