My sister wants to disown me?

My sister became friends with her best friend (Amy) about 6 yrs ago...and from the first day i met her..i didn't like Amy..our personalities didn't agree..and i found that she had many bad qualities..however my sister put her on this pedestal and I didn't care because it was not like she was my friend..slowly her friend started to get on the good side of my mom and my other siblings..to the point where she was at my house 24/7 i felt like their was no privacy and my sister would even tell her my business, why is she so nosey and CLINGY?..long story short..Amy has many sisters who..are very nice to her and do her alot of favours..so my sister started comparing me to them and say u arent like that to me and so forth..now we just got in an argument and my sister tells me she considers Amy and her sisters more of a sister than me..ouch! i admit i have my rude moments but i really feel like their sabotaging our relationship..what should i do to repair it..and please don't say become friends with Amy cuz i know that can never happen..thanks.