I feel bad. :(
This post may include affiliate links.
I've been constantly bullied at school - with zero support from teachers or parents. It was a very hard time from circa 1974 to 1981. Took me decades to become self-confident again.
I know how you feel. I have been bullied by school peers since the 2nd grade, as well as isolated since kindergarten. I'll be here if you need me!
High school- was only known as her older sister. Sucks enough being an introvert but when your younger sister was the popular homecoming queen/cheerleader/salutatorian/etc., well, you get overlooked. A lot.