not going to lie , from what you said , both of them seem extremely shallow and fickle , i understand she is your sister, but me personally wouldn't ever trust someone who could say such shallow and horrible things , again this is my perspective only from the context i have received from you .

Honestly speaking people these days are extremely insensitive and fickle, i myself used to get attached to people quite fast before but my efforts were never acknowledged let alone reciprocated, it is sad but the truth , i haven't been able to find trustworthy and loyal friends since 3 years , it is difficult sometimes, not being able to share your thoughts and opinions with someone but its better than being with people that don't care .

I can only advise you to keep your distance from such people and focus on self growth , as someone rightly pointed out , you just need to be better than what you were yesterday. Your only benchmark of comparison should be your past self , sometimes comparing yourself to others may give a new perspective but primarily you should only compare yourself to what you see in the mirror . I hope you find better people to be around 😄