(Important: please don't read if ur under 14)
So, where's the problem again? Your cousin was your friend and now she's not? or was she never your friend and u thought she was? But if she never was your friend why are you sad now? and if she was, isn't she your cousin too? so if you don't consider her a friend, you can't stop being her cousin, right?
Aaah, i c, there's the problem. U want out from this "cousinship" but there's no out really.
Well i can't help here, except by saying "Get a life, find a boyfriend, plan your future, and don't stop living"