Why does nobody believe me?thats not fair!!!?

On tuesday the 21.12.10 at 18:45 my 9 year old sis came to me and started biting me in the arm when i was on the computer then she started licking the edg of my computer after that i told here stop that she didn't, so i pushed here head away then she started screaming,well im 10,,,, then my dad came in he was shouting with me and gave me a light smack left and right then i started to tell him the true story he didn't believe me and he aid:then i said:(SISTERS NAME secret) isn't that true that you where trying to bite me>?my si said: