My best friends make fun of me :/ !!x?

I got told that i was one of the top ten people in my year in school today and i told my three best friends, but they didn't say well done or anything, one of them said 'i bet you thought you were really cool!' i said 'no not really' and she just laughed and my other two best friends did aswell, and if i say like im doing something the same one that says 'i bet you thought you were really cool' said 'ooo cos your hard' im fed up of them not being supportive, what should i do and what should i say when she ses this!!!!!!!????????xxxx