I am jealous of my sister.

Me (19f) is jealous of my sister (16f). Some background info. Me and my sister lived in the south for 12 years. She was born there and i was not but that place was my home. When i was 14 we moved across the country to be closer with family (who i hate). We moved in 2021. I left my life behind. My best friend, my family (non biological) everything and everyone i loved. Ive have now been living in the west for 4 years. I started highschool here as a freshman with no friends, no relationships from middle school. And i never really fit in. Never have. I have now graduated from highschool and have gotten engaged. I love my fiancée dearly, he is my best friend but is it selfish of me to want a platonic ride or die too? My sister lets call her amy, and her best friend lets call her jamie. Amy and jamie met in middle school, when we first moved to the west, and have been attached at the hip ever since. Like if they turned out to have fallen for each other you wouldn't bat an eye, best friends. Me on the other hand. I have a group of friends i met in highschool that i love (all in the 18 to 19 age range) but they all love to drink and go out and party. I dont. And i dont really fit in with them. I love anime, im a furry (not the kinky kind i promise), i cosplay and im just idk different from them. And i always feel left out. They have all these inside jokes from when they go out. And i look so much different from them too. They are all gorgeous and i am not. And recently i feel as though we have been growing apart, since i dont want to go out and party. So seeing my sister with her best friend makes me so angry and jealous. I just wanna find someone who sees me as their ride or die. The best friend i had in the south grew apart, and a we talk a bit but its not the same. I dont want my partner to be the only person i care about yk? Like i want a best friend but its hard to find one who has the same ideals as me or interests and im too scared to look online for someone. Sorry for the long post. I just needed to rant.

Tldr: my sister has a best friend and i dont. Im jealous of her.