What Would U Do If They Treated U This Way ???

Hello well i have a problem my quinceanera is going to be next year and i have been having some problems with this two gurls who i tought they where my friends they just use me when they need me or when they have nobody to hang with and i asked them to be my damas and they accepted but i just don`t know what to do i don`t feel confterble around them i feel like they talk behind my back all the time what would u gurls do in my situation??? plz help me out i need to do something.